Gabor Kaszab has posted comments on this change. Change subject: IMPALA-5511: Add process start time to debug web page ......................................................................
Patch Set 1: (1 comment) http://gerrit.cloudera.org:8080/#/c/7363/1/be/src/util/process-state-info.cc File be/src/util/process-state-info.cc: PS1, Line 176: /proc/$0/ > Is the ctime of this directory documented to be the process start time? Good point. After some research it seems that making 'stat' on the /proc/ directory entries is not the reliable way of checking the start time as they might be updated after startup (even the ctime). I guess using stat() would result the same issue here. I found 2 solutions: 1) Invoking "ps -o lstart --pid <pid>" via command line 2) There is tricky solution mentioned here in the second comment: https://stackoverflow.com/questions/6514378/how-do-you-get-how-long-a-process-has-been-running?rq=1 Basically, you can get theprocess_start_time from /proc/<pid>/stat (22nd value), but that is the time difference between system boot and process start. In order to get the desired start_time you have to get the boot_time from /proc/uptime and using the current time you can calculate it from these. I would vote for 1) What do you think? -- To view, visit http://gerrit.cloudera.org:8080/7363 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: comment Gerrit-Change-Id: I05ae2f80835b1b0e4bc3b38731778ba0871338a4 Gerrit-PatchSet: 1 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Gabor Kaszab <[email protected]> Gerrit-Reviewer: Attila Jeges <[email protected]> Gerrit-Reviewer: Dan Hecht <[email protected]> Gerrit-Reviewer: Gabor Kaszab <[email protected]> Gerrit-Reviewer: Henry Robinson <[email protected]> Gerrit-Reviewer: Laszlo Gaal <[email protected]> Gerrit-Reviewer: Tim Armstrong <[email protected]> Gerrit-HasComments: Yes
