I did the whole test with HTTP this time On Sat, Feb 11, 2012 at 3:05 PM, Ishita Kapadiya <ishimegh@xxxxxxxxx> wrote: > Hi Rainer, > > Thanks. I forogt to mention that I was using HTTPS with Keepalive > disabled. Based on your hint, i again tried to monitor netstat o/p and > mod_status o/p. > I have used below command for ab script - ./ab -n 10000 -c 50 > http://1.2.3.4/xyz.html > I was monitoring netstat o/p through script each second - netstat > -antp | grep -w 1.2.3.4:80 | grep EST | wc -l > Here is the o/p - > 16 > 27 > 13 > 13 > 8 > 18 > 9 > 18 > 16 > 2 > 16 > 18 > 13 > 22 > 18 > 31 > 60 > 0 > 0 > 14 > 115 > 0 > 13 > 7 > 0 > 72 > 0 > 111 > 0 > 0 > 65 > > When I was monitoring mod_status o/p it was showing almost 45-49 > requests currently being processed which is matching with 50 > concurrent users test. Of course, as expected no "K" present in the > o/p as i have disabled keepalive. All req were showing as etiher "C" > or "W" > > My concern is netstat o/p shown above. why there is so much variation? > Even if we take avg. of above values, it comes to 23.06 connections! > > Please provide your thoughts. > > On Sat, Feb 11, 2012 at 7:25 AM, Rainer Jung <rainer.jung@xxxxxxxxxxx> wrote: >> On 11.02.2012 06:11, Ishita Kapadiya wrote: >>> >>> Hi All, >>> >>> Recently I did 'ab' test just to check performance of my new setup. so >>> far, if we want to check concurrent users for that server, we were >>> using "netstat -an | grep 'EST' | wc -l" to check how many total no of >>> connections being used. I know we can use mod_status to get the >>> accurate results. but I am curious to know, how to determine total no >>> of concurrent connections being served by Apache web server at any >>> point of time. Even though I have set 50 concurrent users test with >>> 'ab', I hardly see 50 ESTABLISHED connections! Even I checked total no >>> of CLOSE_WAIT, TIME_WAIT& ESTABLISHED connections but that was also >>> >>> not matching with the result of what mod_status was showing. >>> >>> Can anyone let me know what could be the reason? I want to know how to >>> determine that MaxClients limit is approaching just by looking into >>> netstat o/p (or any other command) without using mod_status. >> >> >> netstat established and mod_status should show figures close to each other. >> The deltas are: >> >> - If using ab without "-k" you are not using HTTP Keep-Alive, i.e. each >> request needs to open an new TCP connection. When using "-k", mod_status >> shows established connections which did not yet receive any follow-on >> requests with a "K" >> >> - When doing HTTPS, SSL handshakes are between connection establishment and >> requests >> >> - ab itself is single threaded but very efficient. So if you push >> concurrency very far, ab itself will need to process the results send back >> from the web server. Concurrency 50 should be fine though. >> >> Can cou give us some numbers? If you let run ab with "-k" for a longer time, >> what numbers do you see in netstat, and which number of each letter >> typically in the server-status? Are you using HTTPS? >> >> Regards, >> >> Rainer >> >> --------------------------------------------------------------------- >> 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 >> --------------------------------------------------------------------- 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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