[Zope] Zope's performance on xBSD

[Giorgos Verigakis]

On Fri, 17 Aug 2001, Chris McDonough wrote:

> Hi Giorgios,
>
> Let me see if I understand the testing methodology and results... You
> generate load using your program, and while the program is running, you
> try to reload the page in a browser..  right?

Yes, that's right


>
> Furthermore, your test results show that on Linux, the time it takes to
> reload the page under any of the tested loads is virtually the same,
> while on BSD, the time that it takes to reload the page appears to be
> related to the load in an O(n^2) way.

That's right again. I haven't produced any graphs to know if it is
O(n^2) but it sure is non-linear.


>
> I don't know the answer, but I just want to restate the findings in
> another way so that you can tell me if I'm misunderstanding them.

Well, apologies if I wasn't very clear...


>
> - C
>
>
> Giorgos Verigakis wrote:
> >
> > Hello, I'm using Zope on FreeBSD and OpenBSD and I've noticed some
> > serious performance issues. Since I hadn't experienced any problems
> > at the past with Linux, I did some benchmarks.
> >
> > I've written a small program that connects to Zope and tries to
> > retrieve a non-existant URL (source code appended). While Linux
> > performed almost linearly depending on the number of hits/sec,
> > FreeBSD and OpenBSD performed exponential.
> >
> > I did the following experiment:
> > I installed a binary distribution of python-1.5.2 (pkg_add or apt-get)
> > and I compiled Zope-2.3.3+HotFix from sources (with wo_pcgi.py).
> > I entered Zope's management screen and expanded all folders. I ran
> > the previous program and after about 1000 hits I reloaded the page
> > and measured the time it gets to finish. The results are below:
> >
> > |---------------------+------------+---------------+-------------+
> > |        OS           | Hit Rate*  | Real hit rate | Reload time |
> > |                     | (hits/sec) | (hits/sec)    | (sec)       |
> > |---------------------+------------+---------------+-------------+
> > |                     |     30     |      20       |      13     |
> > | Linux debian 2.2.19 |     50     |      33       |      16     |
> > |                     |    100     |      38       |      16     |
> > |---------------------+------------+---------------+-------------+
> > |                     |     30     |      20       |      10     |
> > | FreeBSD 4.3-Release |     50     |      33       |      23     |
> > |                     |    100     |      40       |     100     |
> > |---------------------+------------+---------------+-------------+
> > |                     |     30     |      20       |      10     |
> > | OpenBSD 2.9-Release |     50     |      33       |      15     |
> > |                     |    100     |      50       |     285     |
> > |---------------------+------------+---------------+-------------+
> > *The hit rate is the one passed as an argument to the program, while
> > real hit rate was calculated according to Zope's log file.
> >
> > All tests were ran on the same computer, a 600MHz Celeron with
> > 192MB RAM
> >
> > These tests were ran using the default Data.fs. When I use a real
> > Data.fs + my products I even get time outs when I try to access
> > the content.
> > Why is there such a difference between the OSs? Do the BSD users of
> > this list experience similar problems?
> >
> > Giorgos Verigakis
> >
> > ------------------ 8< ------------------
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <unistd.h>
> > #include <sys/types.h>
> > #include <sys/socket.h>
> > #include <netinet/in.h>
> > #include <netdb.h>
> >
> > int main(int argc, char *argv[])
> > {
> >         struct sockaddr_in sa;
> >         struct hostent *hp;
> >         int s;
> >         int i, t, len;
> >         unsigned long sleeptime;
> >         char request[128];
> >         char *url="/foo";
> >
> >         if (argc != 4) {
> >                 printf("Usage: %s <host> <port> <rate>\n", argv[0]);
> >                 printf("rate in hits/sec\n");
> >                 exit(1);
> >         }
> >
> >         if ((hp = gethostbyname(argv[1])) == NULL) {
> >                 printf("error looking up host\n");
> >                 exit(1);
> >         }
> >
> >         sprintf(request, "GET %s HTTP/1.0\015\012\015\012", url);
> >         len = strlen(request);
> >         sleeptime = (1 / atof(argv[3])) * 1000000;
> >
> >         bzero(&sa, sizeof(sa));
> >         bcopy(hp->h_addr, (char *)&sa.sin_addr, hp->h_length);
> >         sa.sin_family = hp->h_addrtype;
> >         sa.sin_port = htons(atoi(argv[2]));
> >
> >         for (i = 0;; i++) {
> >                 if (( s= socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
> >                         printf("Socket error\n");
> >                         continue;
> >                 }
> >
> >                 if (connect(s, (struct sockaddr *) &sa, sizeof sa) < 0) {
> >                         printf("Connection error\n");
> >                         close(s);
> >                         continue;
> >                 }
> >
> >                 t = write(s, request, len);
> >                 printf("i=%d: %d bytes\n", i, t);
> >
> >                 usleep(sleeptime);
> >
> >                 close(s);
> >         }
> > }
> > ------------------ 8< ------------------
> >
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