Jeffrey Ng wrote:
I am the coworker of Fayland who posted the topic "memory usage of
mod_perl process".
Our company has invested quite some time on migrating our perl code to
catalyst (more than half year of time by 7 programmers). However, I am
starting to worry that moving to catalyst is causing too much overhead
for our processes and thus severely slowing down our site.
I remember the memory usage of each process before catalyst was around
25Mb. And now the new code is using around 90MB as fayland said. During
peak hour, our servers were able to handle 30+ requests per sec before
catalyst upgrade. Now we are only able to handle around 10 requests per
sec.
As a result, the response time of the site is much slower after the
upgrade. it takes at least 2 sec for the browser to start responding
during non-peak hours.
Here's the memory stats for a typical process:
Memory Usage (in bytes):
Size : 97107968 (92.6M)
Share : 6012928 ( 5.7M)
VSize : 97107968 (92.6M)
RSS : 85131264 (81.2M)
Memory Segments Usage (in bytes):
Text : 253952 ( 248K)
Shlib : 0 ( 0K)
Data : 78696448 (75.1M)
Stack : 0 ( 0K)
I have read practical mod_perl. I tried to preload many of our modules
in startup.pl. But the shared memory value doesnt change at all. Also,
doesnt 5.7M shared memory usage sound too small comparing to the 92.6M
total size?
I wonder how much is your shared memory? Is the memory overhead of
catalyst huge? Is catalyst inherently slow?
I too have found that my Catalyst apps are "huge" compared to previous mod_perl
or FastCGI apps. I had been using Class::DBI and a hand-rolled framework, but
now use Catalyst and DBIx::Class. The difference is at least a factor of 2.
It's not been a problem for me at my current traffic levels, and I'm more than
happy to trade some RAM for the joy the design and coding has become compared to
my previous situation.
But I do wonder where all the RAM is going. I especially concur that not much
is being shared which is curious given that the modules are preloaded by
mod_perl. I had done some profiling to measure how much RAM a dummy Cat app
took vs a dummy DBIC schema, maybe I'll dig that up and send it to the list.
Best,
Brian
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