[Pharo-project] Nanosecond-level profiling in Pharo?
Hi! I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)? Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
2010/1/7 Alexandre Bergel <alexandre@bergel.eu>:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel  http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
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-- Best regards, Igor Stasenko AKA sig.
Ok, good to know. Thanks Igor, Alexandre On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel <alexandre@bergel.eu>:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers. Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution? HTH, -- Cesar Rabak Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu: Ok, good to know. Thanks Igor, Alexandre On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
This is the level of state-of-the-Art Java profilers operate with. Cheers, Alexandre On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
Do you have information if the "level" is resolution only or effective accuracy? I got curious on this! -- Cesar Rabak Em 08/01/2010 15:56, Alexandre Bergel < alexandre@bergel.eu > escreveu: This is the level of state-of-the-Art Java profilers operate with. Cheers, Alexandre On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
Do you have information if the "level" is resolution only or effective accuracy?
No idea. You can contact the guy who mentioned this to me: http://www.inf.usi.ch/faculty/binder/ Cheers, Alexandre
-- Cesar Rabak
Em 08/01/2010 15:56, Alexandre Bergel < alexandre@bergel.eu > escreveu:
This is the level of state-of-the-Art Java profilers operate with.
Cheers, Alexandre
On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
ask him. I do not see how people can ask him like that while you discussed with him On Jan 8, 2010, at 7:38 PM, Alexandre Bergel wrote:
Do you have information if the "level" is resolution only or effective accuracy?
No idea. You can contact the guy who mentioned this to me: http://www.inf.usi.ch/faculty/binder/
Cheers, Alexandre
-- Cesar Rabak
Em 08/01/2010 15:56, Alexandre Bergel < alexandre@bergel.eu > escreveu:
This is the level of state-of-the-Art Java profilers operate with.
Cheers, Alexandre
On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
This is troubling indeed. I will ask. Alexandre On 9 Jan 2010, at 09:16, Stéphane Ducasse wrote:
ask him. I do not see how people can ask him like that while you discussed with him
On Jan 8, 2010, at 7:38 PM, Alexandre Bergel wrote:
Do you have information if the "level" is resolution only or effective accuracy?
No idea. You can contact the guy who mentioned this to me: http://www.inf.usi.ch/faculty/binder/
Cheers, Alexandre
-- Cesar Rabak
Em 08/01/2010 15:56, Alexandre Bergel < alexandre@bergel.eu > escreveu:
This is the level of state-of-the-Art Java profilers operate with.
Cheers, Alexandre
On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo- project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
really? When I read what elliot said also with the precision I have some doubts.
This is the level of state-of-the-Art Java profilers operate with.
Cheers, Alexandre
On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- Best regards, Igor Stasenko AKA sig.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
Intel CPUs have the ability to read the clock count through the RDTSC instruction, with OS access through QueryPerformanceCounter() on windows, clock_gettime() under linux and mach_absolute_time() on MacOS. Using this, I think it should be practical to have nanosecond precision for profiling under some conditions. See also http://en.wikipedia.org/wiki/Time_Stamp_Counter Cheers, Martin On 09/01/2010, at 10:45 PM, Stéphane Ducasse wrote:
really? When I read what elliot said also with the precision I have some doubts.
This is the level of state-of-the-Art Java profilers operate with.
Cheers, Alexandre
On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
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I remember to have seen once at a keynote that some people use statistic to reach that level of granularity. Something like, if executing n instructions took 1 second, and in 1 second you have so many CPU cycle, then you can deduce the average number of CPU cycle to execute a fraction of the whole computation. Cheers, Alexandre On 9 Jan 2010, at 09:15, Stéphane Ducasse wrote:
really? When I read what elliot said also with the precision I have some doubts.
This is the level of state-of-the-Art Java profilers operate with.
Cheers, Alexandre
On 8 Jan 2010, at 14:48, csrabak@bol.com.br wrote:
I don't want to rain in your folks party, but a nanosecond is a millionth of a millisecond. Also, it is at the timing of silicon memory access on present microcomputers.
Isn't enough you increase the accuracy of the timing by one thousand looking for a solution to get *microsecond* resolution?
HTH,
-- Cesar Rabak
Em 07/01/2010 20:57, Alexandre Bergel < alexandre@bergel.eu > escreveu:
Ok, good to know.
Thanks Igor, Alexandre
On 7 Jan 2010, at 19:29, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel :
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
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-- Best regards, Igor Stasenko AKA sig.
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-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
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-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
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-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
On Fri, Jan 08, 2010 at 12:29:18AM +0200, Igor Stasenko wrote:
2010/1/7 Alexandre Bergel <alexandre@bergel.eu>:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
AFAIK, there's no primitives in VM, which provide timing with nanosecond precision.
Also, the accuracy of the #millisecondClockValue available to the image is different on different platforms. I haven't checked lately, but I think the Windows VM is good pretty much to the nearest millisecond, while Linux is more variable. Not sure about OS X or other unixy platforms. So even if you are dealing with times that are measured to millisecond precision, the accuracy may be less depending on the underlying platform and VM. Dave
Some times I wanted smaller grain for running tests... but most of the time millis are good enough :) On 2010-01-07 18:52:16 -0300, Alexandre Bergel <alexandre@bergel.eu> said:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
Cheers, Alexandre
I think Eliot wanted those in my vm work I think qwaq has them time to add them I think should it return a Long integer or a double On 1/7/10, Esteban Lorenzano <estebanlm@gmail.com> wrote:
Some times I wanted smaller grain for running tests... but most of the time millis are good enough :)
On 2010-01-07 18:52:16 -0300, Alexandre Bergel <alexandre@bergel.eu> said:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
Cheers, Alexandre
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-- =========================================================================== John M. McIntosh <johnmci@smalltalkconsulting.com> Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com ===========================================================================
Thanks for all your answers. cheers, Alexandre On 8 Jan 2010, at 01:22, John McIntosh wrote:
I think Eliot wanted those in my vm work I think qwaq has them time to add them I think
should it return a Long integer or a double
On 1/7/10, Esteban Lorenzano <estebanlm@gmail.com> wrote:
Some times I wanted smaller grain for running tests... but most of the time millis are good enough :)
On 2010-01-07 18:52:16 -0300, Alexandre Bergel <alexandre@bergel.eu> said:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
Cheers, Alexandre
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-- = = = = = ====================================================================== John M. McIntosh <johnmci@smalltalkconsulting.com> Corporate Smalltalk Consulting Ltd. http:// www.smalltalkconsulting.com = = = = = ======================================================================
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-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
this is a reply to John's point and to Cesar's ,essage On Thu, Jan 7, 2010 at 8:22 PM, John McIntosh < johnmci@smalltalkconsulting.com> wrote:
I think Eliot wanted those in my vm work I think qwaq has them time to add them I think
Yes. We haven't moved to using it at the image level yet but the VM uses 64-bit microseconds from 1901 internally. The current value of the clock however is updated by the VM's heartbeat which runs anywhere from 500Hz to 1KHz. So while the clock has microsecond precision it only has millisecond resolution. I made a similar change to VisualWorks, which uses 64-bit microseconds from 1901. The advantage is that sub-second time values are actually wall clock values, as opposed to a 32-bit millisecond value that will wrap after 49 days that is unsynchronised with wall time. BTW, 64 bit microseconds from 1901 is ~580,000 years. So with e.g. 61-bit tagged integers in a 64-bit VM with maximum positive value of 2^60 - 1, the clock would take ~35,000 years to overflow tagged integers.
should it return a Long integer or a double
An unsigned long integer.
On 1/7/10, Esteban Lorenzano <estebanlm@gmail.com> wrote:
Some times I wanted smaller grain for running tests... but most of the time millis are good enough :)
On 2010-01-07 18:52:16 -0300, Alexandre Bergel <alexandre@bergel.eu> said:
Hi!
I am currently working on a new profiler for Pharo. The idea is to graphically renders a profiling using Mondrian. I hope to release it soon. When discussing with an expert in the field (Walter Binder), the question about time grain was raised. I am partly based on MessageTally, which has a millisecond grain. Anyone is aware of a finer grain? At the level of nanosecond? Does it makes sense since there is no JIT (yet)?
Cheers, Alexandre
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-- =========================================================================== John M. McIntosh <johnmci@smalltalkconsulting.com> Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com ===========================================================================
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participants (9)
-
Alexandre Bergel -
csrabak＠bol.com.br -
David T. Lewis -
Eliot Miranda -
Esteban Lorenzano -
Igor Stasenko -
John McIntosh -
Martin Sandiford -
Stéphane Ducasse