[Mono-list] Starting mod_mono in Apache, load jumps to 100% per connection

Ben Clewett ben at roadrunner.uk.com
Tue Oct 28 12:15:33 EDT 2008

I have just upgraded a working system from 1.9.1 to 2.0.1.

# mono --version
Mono JIT compiler version 2.0.1 (tarball)
Copyright (C) 2002-2008 Novell, Inc and Contributors. www.mono-project.com
         TLS:           __thread
         GC:            Included Boehm (with typed GC)
         SIGSEGV:       altstack
         Notifications: epoll
         Architecture:  amd64
         Disabled:      none

# uname -a
Linux fls-16-06 #1 SMP 2008-06-07 01:55:22 +0200 
x86_64 x86_64 x86_64 GNU/Linux

Under this version I have a problem that when Apache starts, if a call 
is made early to mod_mono, as in within about a second of the start, the 
server load jumps to 100% per request.

Further this then locks out further requests, which also set on 100% 
load.  Eg, a 8 connection will result in about 800% load:

  5651 wwwrun    20   0  253m  30m 8712 S  783  0.4  58:52.86 mono

Where the process is running:

/usr/bin/mono /usr/lib/mono/2.0/mod-mono-server2.exe --filename 
/tmp/mod_mono_server_sdi_webservice --applications /:/usr/local/sdi/ws/ 

As far as I can see, these requests at 100% each will sit there for ever 

(If I user mod-mono-server.exe instead of server2, makes no difference.)

If any users have seen this behaviour, and may know where I can take 
this, I would be very interested.  As now we have a dead unusable server!

Kind regards,


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