rafael.munoz wrote:
Hello
Josip Almasi wrote:
rafael.munoz wrote:
Hello
I have been doing some stress and performance tests on James 2.3.1 and I
think I have found a bottleneck on the James spool storing code (I am
using
the filesystem spool).
I have configured James to behave as a simple SMTPServer and do almost
nothing more than receiving mails and storing it in the spool ("<mailet
match="All" class="Null"/>").
Eh, Null?
I was only measuring James input so I was just destroying any incoming
message after retrieving from the spool. 'Null' is refering to the
NullMailet (http://james.apache.org/mailet/standard/mailet-report.html#Null)
Well I know but then maybe those complexity things I said don't apply
here; they generally apply to directories with large number of files.
Josip Almasi wrote:
...
So, summarizing:
...
2. Anyone knows why the FileOutputStream object creation takes more and
more
when James is stress out? The underlying OS is not reporting any problems
with the filesystem or the file descriptors.
Most filesystems store directory entries as lists. Lists are read each
time from beginning so to access Nth entry you'll access N-1 entries,
IOW N*(N-1)/2 complexity.
In fact, AFAIK only FS that doesn't do that is ReiserFS, and I doubt you
can get that on solaris, so better switch to database storage.
Databases use ballanced trees meaning IIRC max N*log(N) avg log(N)
complexity.
Umm .. interesting, I didn't know that. I would check the number on entries
on the spool directory when I start to get huge file FileOutputStream
creation times (that as you implies almost surely are linked to huge file
creation times on the filesystem). And about the database suggestion, I am
afraid it is not an option in our application :(.
Thanks for your answer!
Welcome.
Furthermore, if you use FS, JAMES has to keep list (or map) of messages
in memory. For lists and treemaps, above complexity applies.
Plus, memory usage... spammers kindly provided me with even better
stress test in production:> Check this thread:
http://marc.info/?l=james-user&m=121491652506688&w=2
Regards...
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