httpd-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Xuekun Hu" <xuekun...@gmail.com>
Subject Re: caching limit files in mod_file_cache?
Date Wed, 15 Mar 2006 13:55:07 GMT
Updates.

Sometimes thread segmentation fault would be happened. So I have
chance to print the backtrace.  (Apache2.2.0, worker mpm with
thousands threads)

(gdb) bt full
#0  0x0000002a96412f1f in __read_nocancel () from /lib64/tls/libpthread.so.0
No symbol table info available.
#1  0x000000000047cfaa in ap_mpm_pod_check (pod=0x5) at pod.c:54
        c = 0 '\0'
        fd = 5
#2  0x000000000047b52c in child_main (child_num_arg=0) at worker.c:1223
        threads = (apr_thread_t **) 0xcfc060
        rv = 0
        ts = (thread_starter *) 0x7e0528
        thread_attr = (apr_threadattr_t *) 0x7e0548
        start_thread_id = (apr_thread_t *) 0x7e05a8
#3  0x000000000047b6b2 in make_child (s=0x5ce3d8, slot=0) at worker.c:1306
        pid = 0
#4  0x000000000047bf8e in ap_mpm_run (_pconf=0x0, plog=0x7fbfffcfa3,
s=0x2b72d43088) at worker.c:1508
        pidfile = 0x0
        remaining_children_to_start = 1926508680
        rv = -512
#5  0x000000000042817a in main (argc=3, argv=0x7fbfffd318) at main.c:704
        exit_status = 0
        c = 0 '\0'
        configtestonly = 0
        confname = 0x485523 "conf/httpd.conf"
        def_server_root = 0x485533 "/usr/local/apache2"
        temp_error_log = 0x0
        error = 0xfffffffffffffe00 <Address 0xfffffffffffffe00 out of bounds>
        server_conf = (server_rec *) 0x5ce3d8
        pglobal = (apr_pool_t *) 0x5c1128
        pconf = (apr_pool_t *) 0x5c3138
        plog = (apr_pool_t *) 0x6113a8
        ptemp = (apr_pool_t *) 0x5cb178
        pcommands = (apr_pool_t *) 0x5c5148
        opt = (apr_getopt_t *) 0x5c5230
        rv = 0
        mod = (module **) 0x5ce3d8
        optarg = 0x7fbfffd338 "sõÿ¿\177"
        signal_server = (apr_OFN_ap_signal_server_t *) 0xfffffffffffffe00

Are there any hints?

Thx, Xuekun


On 3/13/06, Xuekun Hu <xuekun.hu@gmail.com> wrote:
> Changed the title to be noticed. :-)
>
> ---------- Forwarded message ----------
> From: Xuekun Hu <xuekun.hu@gmail.com>
> Date: Mar 10, 2006 7:38 PM
> Subject: Re: [users@httpd] mod_mem_cache configuration help
> To: users@httpd.apache.org
>
>
> Thanks for replying.
>
> I tested mod_file_cache. However I also met some errors both with
> cachefile and mmapfile. When I want to cache more than 20 files, there
> are the below errors.
>
> Using cachefile:
> [Fri Mar 10 12:56:47 2006] [info] [client 10.0.1.4] (70014)End of file
> found: core_output_filter: writing data to the network
> [Fri Mar 10 12:56:47 2006] [info] [client 10.0.1.4] (70014)End of file
> found: core_output_filter: writing data to the network
> [Fri Mar 10 12:56:48 2006] [info] [client 10.0.1.3] (70014)End of file
> found: core_output_filter: writing data to the network
> ...
>
> Using mmapfile:
> [Fri Mar 10 15:32:03 2006] [info] [client 10.0.0.7] (14)Bad address:
> core_output_filter: writing data to the network
> [Fri Mar 10 15:32:03 2006] [info] [client 10.0.0.7] (14)Bad address:
> core_output_filter: writing data to the network
> [Fri Mar 10 15:32:03 2006] [info] [client 10.0.1.3] (14)Bad address:
> core_output_filter: writing data to the network
> ...
>
> While when caching below 10 files, all work fine. It seems
> mod_file_cache can't cache many files?
>
> My configuration is:
>  4 x Intel Xeon (EM64T)
>  SLES9 SP2 (64bit)
>
> Is it a bug?
>
> Thx, Xuekun
>
> On 2/24/06, Joshua Slive <joshua@slive.ca> wrote:
> > On 2/23/06, Xuekun Hu <xuekun.hu@gmail.com> wrote:
> > > Hi,
> > >
> > > I want to cache some files and don't want them to be removed if the
> > > cache if full. That's means the cache is serviced as
> > > first-come-first-service basis. Can I do that by setting
> > > "CacheDefaultExpire" to a large number?
> > >
> > > However I found this sentence "If a new object needs to be inserted in
> > > the cache and the size of the object is greater than the remaining
> > > memory, objects will be removed until the new object can be cached.
> > > The object to be removed is selected using the algorithm specified by
> > > MCacheRemovalAlgorithm" in docs. So it seems the objects are hard to
> > > stay in the cache, it has the the chance to be removed out!
> > >
> > > Any ideas? Thanks in advance.
> >
> > It sounds like you may be looking for mod_file_cache.
> >
>
> > If not, you may also want to consider using mod_disk_cache in place of
> > mod_mem_cache, because it allows the OS to be in charge of the memory
> > caching issues (using the OS buffer cache) and hence will often
> > outperform mod_mem_cache.
> >
> > Joshua.
> >
> > ---------------------------------------------------------------------
> > 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@httpd.apache.org
> >   "   from the digest: users-digest-unsubscribe@httpd.apache.org
> > For additional commands, e-mail: users-help@httpd.apache.org
> >
> >
>

Mime
View raw message