| understanding 'top' and cpu performance
is each httpd a visitor? |
jamie
msg:912541 | 4:36 pm on Apr 15, 2003 (gmt 0) |
hi, when i run a top command (RH 7.2 on a 2GHZ processor) i can see quite a few httpd processes. but never any more than 7 or so. is each httpd process a visitor who is at that very moment downloading a page? or do several visitors combine into one httpd process. most of the time the CPU use is between 1% and 4%, but i noticed this morning one httpd process at 18%. should i be alarmed? thanks
|
marcs
msg:912542 | 11:55 pm on Apr 15, 2003 (gmt 0) |
A httpd process is required per web server request. If needed (not enough processes are already running), a new processed is spawned to fulfill a new request. The # of processes doesn't equal # of visitors. | most of the time the CPU use is between 1% and 4%, but i noticed this morning one httpd process at 18%. should i be alarmed? |
|
Probably nothing to worry about. Try seeing if that httpd process has children. Often httpd processes with higher CPU usage spawned child processes to execute a script or what have you. Do something like : ps auxwf¦more look for the httpd process with the higher CPU usage and see if it has child processes and if so, check what they are/do.
|
jamie
msg:912543 | 9:04 am on Apr 16, 2003 (gmt 0) |
many thanks for explanation, i will have to delve into this a bit more. at the moment of course (murphys law) there are no resource intensive httpd processes running.
|
|
|
