On Wed, Jul 14, 2010 at 11:56 AM, Hu Hailin <i@xxxxxxxx> wrote: > the os of my box is CentOS 5.3 and httpd is the built-in one. > >> it may mean that the requests didn't take long to server AND the clock >> is not high resolution > > I thought so as well, but about 90% of the requests are around > 10_000-100_000µs. Meanwhile 0µs requests are about 5%. > It's hard to believe that is a resolution issue. > Also the rate of 0µs request goes up with server's load going up, not > a good sign, I guess. > > Arrrr, it might be something like the requests under 1000µs goes to > 0µs into log file by chance? no idea what you are encountering I just tried %D with built-in httpd on CentOS 5.4 on VMWare on Windows 7 and saw requests in the 3-400 microsecond range, seemingly with microsecond resolution. > > On Thu, Jul 15, 2010 at 12:20 AM, Jeff Trawick <trawick@xxxxxxxxx> wrote: >> On Wed, Jul 14, 2010 at 10:19 AM, Hu Hailin <i@xxxxxxxx> wrote: >>> Hi, >>> >>> http://httpd.apache.org/docs/2.2/en/mod/mod_log_config.html#formats >>> >>> I'm using %D to log the time taken to serve requests. >>> I found the time might be 0 in nonspecific requests. The rate of 0 >>> serving time goes the same trend with server load. >>> >>> Does it mean some kind of timeout? >> >> no >> >> it may mean that the requests didn't take long to server AND the clock >> is not high resolution >> >> is this Windows? if I understand correctly, expensive (in CPU) >> mechanisms are required to get good resolution on Windows >> >> --------------------------------------------------------------------- >> The official User-To-User support forum of the Apache HTTP Server Project. >> See <URL:http://httpd.apache.org/userslist.html> for more info. >> To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx >> " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx >> For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx >> >> > > > > -- > islue > > --------------------------------------------------------------------- > The official User-To-User support forum of the Apache HTTP Server Project. > See <URL:http://httpd.apache.org/userslist.html> for more info. > To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx > " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx > For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx > > -- Born in Roswell... married an alien... --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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