How to work with strace?

Is there a website. Worked until today quite bearable. After lunch began shamelessly blunt.
100% CPU, LA > 10.
In the logs, nothing interesting.
Watching strace, and I understand that do not understand.

Dear, be grateful, share content on the topic - how and where, what to look for in the strace/trace ?
July 9th 19 at 11:28
1 answer
July 9th 19 at 11:30
Do not just go into the jungle, strace will not give you anything.
First look:
1) What process loads percents (top, htop, etc).
2) the Traffic logs of http servers is it different from the previous and expected.
3) Traffic on setevogo, is it different from the previous and expected.

And only then draw conclusions. Maybe just the site posted an article that uber has attracted 100,500 people
Thank you very much. 1, 2 - checked. 3 - no.
In General, I looked again the code that logs slow-php and sort of found the problem.
Hash forms were generated by the method of crypt. - Lucile79 commented on July 9th 19 at 11:33
: i.e., after any release you have started? If so was always it is not the root cause. - Donny71 commented on July 9th 19 at 11:36
: Yes, though a few releases ago I changed the verification mechanism. And with the growth of registered users - revealed the problem. Thank you all - Lucile79 commented on July 9th 19 at 11:39

Find more questions by tags Debugging