it depends what you mean if you talk about Pharo code then those tools should be enough , unless it freezes Pharo (a 100% consumption does not necessarily imply a freeze) if you talk about the Pharo VM itself then you will need to use one of the countless profilers that exist for C/C++ . Some OSes come included with them. MacOS which what I am using can sample a running process and tell you exactly which function/method consumes how much CPU. Obviously more specialised tools can be even more of an assistance like Valgrind http://valgrind.org/ But then it will require knowledge of the Pharo VM internals. if it freezes pharo and you know its pharo code then its a matter of taking a look at changes file and testing on a new image one change at the time until you identify the code that causes the slow down. At least that is what I have done one time I really messed up Morphic draw loop and froze my image. On Sat, Aug 19, 2017 at 2:27 PM Ben Coman <btc@openinworld.com> wrote:

On Thu, Aug 17, 2017 at 7:53 PM, Dimitris Chloupis <kilon.alios@gmail.com> wrote:

...

Are you aware of the profile tools inside Pharo ? They capture execution and offer detailed analysis of how much time is spent on each task. One of it can be found in World Menu -> Tools -> Time Profiler

Thats good for a normal behaving process, but I'm not sure it helps identify a currently-misbehaving process. A (virtual)CPU % could be useful addition to Process Browser.

cheers -ben

...

Generally speaking a while loop that runs all the time without any kind of delays is a very popular way to consume 100%. Even if the while loop does nothing it will still consume %100 because even executing an empty loops has costs. Two solution is inserting a delay in the loop so the loop have to wait for 1 millisecond or less depending your demands or just make sure the loop has a very specific condition so it executes only when you need to.

On Wed, Aug 16, 2017 at 10:04 PM sergio ruiz <sergio.rrd@gmail.com> wrote:

...

hey all.. my current pharo implementation is running super serious processor power, but it shouldn’t be doing much.

[image: Activity_Monitor__All_Processes__and_Pharo_image.jpg]

how would I go about tracking this inside the pharo image?

Thanks!

---- peace, sergio photographer, journalist, visionary

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