tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Santosh Pasi<sp...@diskonnet.com>
Subject Re: Re: Tomcat crashes simultaneous more connection above 990+
Date Thu, 01 Jan 1970 00:00:00 GMT
Hi Jeff,

Thanks for reply.
I am looking around 10,000 to 12,000 concurrent connections.


I have few more questions
1.  i tried both mod_jk and mod_jserver, but i really didn't found any 
improvemnet.  Which is best to use.  if mod_jk then mod_jk(ajp12 or ajp13)?
What other things i can do to increase perfomance .. as it reaches 
around 1200 above connections .. its speed decrease ...
Regards,
Santosh Pasi





---------------Original Message------------------
Date: Mon, 13 Aug 2001 17:46:14 +1000
>From: Jeff Turner <jeff@socialchange.net.au>
>To: Santosh Pasi <spasi@diskonnet.com>
>Cc: tomcat-user@jakarta.apache.org
>Subject: Re: Tomcat crashes simultaneous more connection above 990+
>Mail-Followup-To: Santosh Pasi <spasi@diskonnet.com>, 
tomcat-user@jakarta.apache.org>Content-Disposition: inline
>User-Agent: Mutt/1.3.19i
>
>On Mon, Aug 13, 2001 at 11:01:24AM +0530, Santosh Pasi wrote:
>> Hi,
>> 
>> Still not any reply ????
>> 
>> Is there any tips for compiling tomcat for heavy load ?...
>> After changing few settings .. i can reach upto 1800 simultaneous 
>> connections ... after that tomcat ... didn't send any reply(no more 
crash)...>
>Just how high do you want it to go? I'm quite impressed it got to 990 in
>the first place :) What sort of throughput does that translate to, and
>would your service provider be able to accommodate it anyway? A segv in
>the underlying VM is not likely to be something Tomcat developers can
>fix, what with Java being closed source.
>
>--Jeff
>
>> Regards,
>> Santosh Pasi
>> 
>> 
>> 
>> ---------------Original Message------------------
>> Mailing-List: contact tomcat-user-help@jakarta.apache.org; run by 
ezmlm>> >Precedence: bulk
>> >Reply-To: tomcat-user@jakarta.apache.org
>> >List-Help: <mailto:tomcat-user-help@jakarta.apache.org>
>> >List-Unsubscribe: <mailto:tomcat-user-unsubscribe@jakarta.apache.org>
>> >List-Post: <mailto:tomcat-user@jakarta.apache.org>
>> >To: tomcat-user@jakarta.apache.org
>> >From: Santosh Pasi<spasi@diskonnet.com>
>> >Cc: 
>> >Reply-To: Santosh Pasi<spasi@diskonnet.com>
>> >Date: Sat, 11 Aug 2001	10:14:00 +0530
>> >In-Reply-To: message997426818.spasi@diskonnet.com
>> >Subject: Tomcat crashes simultaneous more connection above 990+
>> >
>> >Hi everyone,
>> >
>> >Can anyone know how much simultaneous connections Tomcat can 
support, >> >where do I need to change the settings to reflect same.  Is no. of 
max. >> >connections support ... is somewhat related with no. of connections 
to >> Tomcat.>Yesterday, I tried all combinations .. still as soon as total 
>> >connections .. reaches above 990 .. 997(at most) it crashes Tomcat.  
>> And no more >process of Tomcat is left.  Although Apache adn other 
applications are >> not >affected.
>> >Is there a no. limitation on child process ... as here child 
processes >> >. increases to some what 1048.. and it crashes.
>> >Same thing i tried on AIX 4.5 ... and it supported above 2600 
process >> >adn finally it crashed there.
>> >We are looking for 10,000 - 12000 simulatenous connections .. it 
means >> >10000-12000 child process java ... is it problem with java .. we ar 
>> using 1.2.2.>Is there any fine tuning that i can do in Tomcat or 
Apache or Linux?>> >
>> >Regards,
>> >Santosh Pasi
>> >
>> >
>> >
>> >---------------Original Message------------------
>> >Mailing-List: contact tomcat-user-help@jakarta.apache.org; run by 
ezmlm>> >>Precedence: bulk
>> >>Reply-To: tomcat-user@jakarta.apache.org
>> >>List-Help: <mailto:tomcat-user-help@jakarta.apache.org>
>> >>List-Unsubscribe: 
<mailto:tomcat-user-unsubscribe@jakarta.apache.org>>> >>List-Post: <mailto:tomcat-user@jakarta.apache.org>
>> >>To: tomcat-user@jakarta.apache.org
>> >>From: Santosh Pasi<spasi@diskonnet.com>
>> >>Cc: 
>> >>Reply-To: Santosh Pasi<spasi@diskonnet.com>
>> >>Date: Fri, 10 Aug 2001	12:30:04 +0530
>> >>In-Reply-To: message997421139.spasi@diskonnet.com
>> >>Subject: Re: Jakarta crashes simultaneous more connection above 990+
>> >>
>> >>Hi,
>> >>
>> >>Even changing pools setting like
>> >>Increasing the pool size resolved the problem, specifically the
>> >>following parameters (neatly copied from the tomcat users guide)
>> >>
>> >>           <Parameter
>> >>                 name="max_threads"
>> >>                 value="200"/>
>> >>             <Parameter
>> >>                 name="max_spare_threads"
>> >>                 value="20"/>
>> >>             <Parameter
>> >>                 name="min_spare_threads"
>> >>                 value="20" />
>> >>
>> >>The values were arbitrary - I stuck mine up to max_threads = 200,
>> >>max_spare_threads=20, min_spare_threads=20
>> >>and lo - the hang problem  went away.
>> >>
>> >>Even I had used options
>> >>
>> >>TOMCAT_OPTS=" -Xms64m"
>> >>
>> >>Didn't solve the problem.
>> >>
>> >>Still same problem.
>> >>
>> >>Regards,
>> >>Santosh Pasi
>> >>
>> >>---------------Original Message------------------
>> >>Mailing-List: contact tomcat-user-help@jakarta.apache.org; run by 
ezmlm>> >>>Precedence: bulk
>> >>>Reply-To: tomcat-user@jakarta.apache.org
>> >>>List-Help: <mailto:tomcat-user-help@jakarta.apache.org>
>> >>>List-Unsubscribe: 
<mailto:tomcat-user-unsubscribe@jakarta.apache.org>>> >>>List-Post: <mailto:tomcat-user@jakarta.apache.org>
>> >>>To: tomcat-user@jakarta.apache.org
>> >>>From: Santosh Pasi<spasi@diskonnet.com>
>> >>>Cc: 
>> >>>Reply-To: Santosh Pasi<spasi@diskonnet.com>
>> >>>Date: Fri, 10 Aug 2001	10:55:26 +0530
>> >>>Subject: Jakarta crashes after 900+ simultaneous connection
>> >>>
>> >>>Hi everyone,
>> >>>
>> >>>We are doing some stress testing. My problem is that when number 
of >> >>>connections reaches around 940..980, jakarta crashes with 
following >> >
>> 
>> 
>>messages------------------------------------------------------------->SIGSEGV 
 11*  segmentation violation>>    si_signo [11]: SIGSEGV   11*  >> segmentation
violation>>>    si_errno [0]: Success
>> >>>    si_code [0]: SI_USER [pid: 0, uid: 0]
>> >>>        stackpointer=0x4c558554
>> >>>
>> >>>Full thread dump Classic VM (1.2.2-L, green threads):
>> >>>    "ppp202" (TID:0x40fb7190, sys_thread_t:0x8d0dec0, state:R) 
prio=5>> >>>        at java.net.SocketInputStream.socketRead(Native Method)
>> >>>        at 
java.net.SocketInputStream.read(SocketInputStream.java:86)>> >>>        at

java.net.SocketInputStream.read(SocketInputStream.java:67)>> >>>        at

java.io.InputStreamReader.fill(InputStreamReader.java:159)>> >>>        at

java.io.InputStreamReader.read(InputStreamReader.java:235)>> >>>        at
java.io.BufferedReader.fill(BufferedReader.java:133)
>> >>>        at java.io.BufferedReader.readLine(BufferedReader.java:270)
>> >>>        at java.io.BufferedReader.readLine(BufferedReader.java:325)
>> >>>        at IRCClient.run(IRCClient.java:799)
>> >>>    "bumba174" (TID:0x40f88f90, sys_thread_t:0x8d0b358, state:CW) 
>> >prio=5>>        at java.lang.Thread.sleep(Native Method)
>> >>>        at IRCClient.run(IRCClient.java:765)
>> >>>    "sunny1176" (TID:0x40f75b28, sys_thread_t:0x8d0b930, state:CW) 
>> >>prio=5>        at java.lang.Thread.sleep(Native Method)
>> >>>
>> >>>
>> >>>......
>> >>>......
>> >>>
>> >>>-------------------------------------------------------------
>> >>>
>> >>>We are using redhat 6.2 Linux, kernel 2.2.16, 
Tomcat-jakarta-3.2.1, >> >>>apache 1.3.14.
>> >>>Hope to get some reply.
>> >>>
>> >>>Regards,
>> >>>Santosh Pasi
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>


Mime
View raw message