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Hi to all, (and happy new year!)
I am doing torture tests on servlets, because we are planning to use Linux +
Apache + JServ for an innovative international Web site we would like to
open in a couple of months. We need a solid and fast platform on which we
could rely, that's why we wanted Linux, Apache and Java. But...
JServ 1.1b1 crashes after less than 12 hours of torture-testing a servlet
that does a JDBC SELECT on an Oracle database through the network and some
regex (gnu.regex) on an HTML template file.
My config:
PII 350/128 Mb RAM on a TR network
Red Hat Linux 6.0
Kernel 2.2.5-15 built for 686
glibc-2.1.2
Apache 1.3.9
JServ 1.1b1
JSDK 2.0 from SUN
JDK 1.2.2 RC3 from blackdown.org
The tests:
Test 1: two perl scripts do 100 GET requests on the servlet (forking 10
times, each child doing 10 requests). This is done as an infinite loop. This
results in doing 75000 requests in 4 hours.
Test 2: two perl scripts do 200 GET requests on the servlet (forking 10
times, each child doing 20 requests).This is done as a cron job, 50 times an
hour. This results in doing 10000 requests in 1 hour.
The first of the 'java' processes (when ps aux) takes about 95% of CPU, the
other about 0%. No get HTTP request succeed on any of our servlets. Simple
HTTP get requests succeed on regular HTML files. (Apache still listening and
serving, but JServ crashed)
I have the following messages in mod_jserv.log (repeated several times):
...
[04/01/2000 12:02:32:369] (EMERGENCY) ajp12: can not connect to host
127.0.0.1:8007
[04/01/2000 12:02:32:388] (EMERGENCY) ajp12: connection fail
[04/01/2000 12:02:32:388] (ERROR) an error returned handling request via
protocol "ajpv12"
...
In access_log :
3399 is the size of the HTML output sent to the browser. Suddenly, Apache
returns nothing :
...
127.0.0.1 - - [04/Jan/2000:04:51:35 +0100] "GET /michel/servlets/jdbc/
HTTP/1.0" 200 3399 "lwp-trivial/1.32"
127.0.0.1 - - [04/Jan/2000:04:56:36 +0100] "GET /michel/servlets/jdbc/
HTTP/1.0" 200 - "lwp-trivial/1.32"
...
HTTP 200 and suddenly HTTP 500 :
...
127.0.0.1 - - [04/Jan/2000:12:02:29 +0100] "GET /michel/servlets/jdbc/
HTTP/1.0" 200 - "lwp-trivial/1.32"
127.0.0.1 - - [04/Jan/2000:12:02:32 +0100] "GET /michel/servlets/jdbc/
HTTP/1.0" 500 647 "lwp-trivial/1.32"
...
I launch JServ separetly with the following script:
#!/bin/sh
jsdk=/usr/local/JSDK2.0/lib/jsdk.jar
jserv=/usr/local/apache/libexec/ApacheJServ.jar
props=/usr/local/apache/conf/jserv/jserv.properties
log=/usr/local/apache/logs/mod_jserv.log
classes=.:/home/michel/servlets/lib/classes111.zip:$jsdk:$jserv
THREADS_FLAG=native
export THREADS_FLAG
date >> $log
/usr/local/jdk1.2.2/bin/java -Xms50m -Xmx60m -classpath $classes
org.apache.jserv.JServ $props >> $log
- limitting the heap size could be the cause ?
- LAN (TCP/IP) problems could be the cause ?
- nb of process limit ?
- nb of sockets ?
- JDK or JServ problem ? (1.1b3 could solve it ?)
Thank you for any help or advice,
and once again, may this year 2000 make your wishes become a reality.
Michel.
--
Michel Szybist
Technologies Appliquées et Internet
STIME - Groupement des Mousquetaires
[EMAIL PROTECTED]
Tél: +33 1 4148 3231
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