[cvsnt] CVSNT slow response with multiple users

Alexey Panchenko alex.panchenko at gmail.com
Tue Jan 29 06:34:46 GMT 2008

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Probably this is caused by locking. Are you using lockserver?

You can connect to it using any telnet client and execute commands:
- Monitor
- Locks
to list active locks.

Each new lock request is iterating over all previous locks linearly
and if you have many files and many simultaneous users - that could be
the bottleneck.


On Jan 29, 2008 10:28 AM, John Van Norman <jvn76 at msn.com> wrote:
> We are having an ongoing issue with CVSNT version 2.5.03 (Scorpio) Build
> 2382 where CVS transactions become extremely slow if more then a couple of
> people are hitting the server at once.
> The server has Windows Server 2003 Standard with Service Pack 2, dual
> dual-core 3.0 GHz Xeon processors, 4GB of ram, two 1GB NICs (bound
> together), and EMC Symmetrix SAN storage.
> There are five repositories on the server, of which three are in active
> development.  The largest repository is 5GB.  The largest module within that
> repository is 1.15GB.  When checked out that module is 580MB.
> We have about 70 people working on this project, 6 of which are in a remote
> office connected by a 15Mb T3.
> DNS has been verified to be working correctly for all clients and the
> server.  During the times that CVS is responding slowly, processor usage is
> rarely above 5%, memory usage is at about 1GB sometimes up to about 1.5GB
> depending on what the transactions are doing, disk queue length is typically
> 0 to 1, network usage is at about .5%, and local checkouts on the server it
> take just as long as from a client pc.
> I have tried having everything run on local disks instead of the SAN; all
> transactions ran slower.  Removing on access virus scanning helped improve
> speeds by about 20% for a single isolated transition (no one else on the
> server), but CVSNT still responded slowly when multiple people were using
> the server.
> The problem seems to be most evident when more then one connection from the
> remote office is established.   CVS seems to be responding to all cvs.exe
> processes at the same speed as the slowest process.
> When this problem occurs, the only way to clear it up seems to be to kill
> most of the cvs.exe processes on the server.  At that point the
> What am I missing?  Does anyone have any ideas of what could be causing
> these slowdowns?
> Any help would be appreciated.
> Thanks,
> John

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