Re: [Monotone-devel] Monotone performance degrades dramatically

[Thomas Moschny]

On Thursday 31 August 2006 19:45, Steven Grimm wrote:

> And I am definitely seeing performance degrade. The first 20 revisions
> took about 6 seconds to get through; now it's up at revision 485 and
> it's taking 2 seconds per commit. While it's sitting there it is chewing
> 100% of one of the machine's CPUs, so it doesn't seem to be I/O bound.

This is a known problem. The commit command calls get_branch_heads() (at 
least) two times; and get_branch_heads() execution time is directly dependent 
on the number of revisions already in that branch. This is not directly a bug 
of get_branch_heads(), but a problem of erase_bogus_certs() which validates  
certificates over and over again. This is absolutely unnecessary, because the 
validity of a cert (not to be confused with the trust in that cert) is a 
constant. It could be verified once and for all and stored in the database 
together with the cert.

Simply no one has gotten around implementing that.

Thomas

-- 
Thomas Moschny  <address@hidden>