---------------------------------------------------------------- BEFORE YOU POST, search the faq at <http://java.apache.org/faq/> WHEN YOU POST, include all relevant version numbers, log files, and configuration files. Don't make us guess your problem!!! ---------------------------------------------------------------- You might check the maxConnections parameter in jserv.properties (your OS must have that many file descriptors allocated) or the APJServVMTimeout property (I think this one's in jserv.conf, although I'm not sure). >---------------------------------------------------------------- >BEFORE YOU POST, search the faq at <http://java.apache.org/faq/> >WHEN YOU POST, include all relevant version numbers, log files, >and configuration files. Don't make us guess your problem!!! >---------------------------------------------------------------- > > >I have an observation/question with regards to differences between >running the IBM JVM (1.1.8) and the JRockit JVM to run the JServ 1.1 >servlet engine on Win NT. > >I have noticed that under heavy loads mod_jserv starts reporting errors >as it cannot successfully make a socket connection to the JServ server >running under the JVM. > >I have only noticed this being a problem under Windows NT. On other >platforms (Solaris, Linux) this socket connection problem doesn't seem >to occur. > >Now to the point. In my testing of JRockit vs. the IBM JVM, it seems >that JRockit exhibits this problem much more than the IBM JVM (also in >tests I have done between the IBM and Sun JVMs, IBM also fairs better >than the Sun JVM in this same regard). > >So is there something I can configure in JRockit to eliminate, or at >least minimize these socket connect errors? Other that this problem, >JRockit seems to run my servlets faster than the IBM JVM (which until >now had been the fastest I had tested on WinNT). However with the >significant increase in errored requests under heavy load the increase >in performance of JRockit is not worth the decrease in stability. > > >Testing Results: > # of Simulated Clients (via Microsoft Web >Application Stress Tool) > 10 20 >40 70 > JRockit IBM JRockit IBM JRockit IBM >JRockit IBM > ---- ---- ---- ---- ---- ---- >---- ---- >Total Requests 1499 1403 1592 1408 1827 1343 >2052 1449 >Total Successful Requests 1492 1403 1452 1408 1375 1343 >1338 1446 >Total Errored Requests 7 0 140 0 452 >0 714 3 >Successful Requests/Sec 49.7 46.8 48.4 46.9 45.8 44.8 >44.6 48.2 > >These tests where run with Apache 1.3.12, JServ 1.1, (JRockit 1.0 or IBM >JVM 1.1.8), Microsoft Web Application Stress Tool all running on a >450MHz Pentium II with 128M RAM running WinNT 4.0 SP5. (note that both >client and server load were running on the same machine). > > >The specific error from the JServ log (both JRockit and the IBM JVM >produced the same error, although the IBM JVM errors much less >frequently) is: > >[28/03/2000 19:05:14:823] (EMERGENCY) ajp12: can not connect to host >127.0.0.1:8007 >[28/03/2000 19:05:14:823] (EMERGENCY) ajp12: connection fail >[28/03/2000 19:05:14:823] (ERROR) an error returned handling request via >protocol "ajpv12" > > >The source code for the mod_jserv routine that originates this error is: > >static int ajpv12_open(jserv_config *cfg, pool *p, unsigned long >address, > unsigned short port) { > struct sockaddr_in addr; > int sock; > int ret; > > /* Check if we have a valid host address */ > if (address==0) { > jserv_error(JSERV_LOG_EMERG,cfg,"ajp12: %s", > "cannot connect to unspecified host"); > return -1; > } > > /* Check if we have a valid port number. */ > if (port < 1024) { > jserv_error(JSERV_LOG_INFO,cfg,"ajp12: %d: %s", > port, > "invalid port, reset to default 8007"); > port = 8007; > } > addr.sin_addr.s_addr = address; > addr.sin_port = htons(port); > addr.sin_family = AF_INET; > > /* Open the socket */ > sock=ap_psocket(p, AF_INET, SOCK_STREAM, 0); > if (sock==-1) { > jserv_error(JSERV_LOG_EMERG,cfg,"ajp12: %s","can not open >socket"); > return -1; > } > jserv_error(JSERV_LOG_DEBUG,cfg,"ajp12: opening port %d",port); > > /* Tries to connect to JServ (continues trying while error is EINTR) >*/ > do { > ret=connect(sock,(struct sockaddr *)&addr,sizeof(struct >sockaddr_in)); >#ifdef WIN32 > if (ret==SOCKET_ERROR) errno=WSAGetLastError()-WSABASEERR; >#endif /* WIN32 */ > } while (ret==-1 && errno==EINTR); > > /* Check if we connected */ > if (ret==-1) { > jserv_error(JSERV_LOG_EMERG,cfg,"ajp12: %s %s:%d", > "can not connect to host", > inet_ntoa(addr.sin_addr), > port); > return -1; > } >#ifdef TCP_NODELAY > { > int set = 1; > setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&set, > sizeof(set)); > } >#endif > > /* Return the socket number */ > return sock; >} > > > >Does anyone have any suggestions on how to get JRockit to perform better >under heavy load? > >thanks, >--Barry > > >-- >-------------------------------------------------------------- >Please read the FAQ! <http://java.apache.org/faq/> >To subscribe: [EMAIL PROTECTED] >To unsubscribe: [EMAIL PROTECTED] >Archives and Other: <http://java.apache.org/main/mail.html> >Problems?: [EMAIL PROTECTED] -- -------------------------------------------------------------- Please read the FAQ! <http://java.apache.org/faq/> To subscribe: [EMAIL PROTECTED] To unsubscribe: [EMAIL PROTECTED] Archives and Other: <http://java.apache.org/main/mail.html> Problems?: [EMAIL PROTECTED]
