Hi Vlatko,
Unless this is a side effect of calling getrusage() (perhaps it causes the OS to
update stats) I don't see how this is possible.
Your reproducer seems to require postgres so I'm unable to run it. If you can
provide a version that doesn't need postgres I can take a look.
Ömer
Vlatko Basic
Hello ghc-devs,
I wrote about this issue to haskell-cafe, but received no reply as of today, so I'm hoping I could get some answer(s) here.
I wrote a small Servant server that communicates with the same other server(s).
When compiled without "-with-rtsopts=-T", I see in 'gnome-system-monitor' that memory used by each server constantly growing.
I was investigating the issue, and found that it is (probably) not in my code, but in one http call (Servant client call to the same server).
When I compile it with "-with-rtsopts=-T", the memory is constant and steady.
Tested on Arch Linux with Stack LTS 13.14.
If any one wants to test this, here are the steps: (server is standalone and does not require any external services (like DB, Redis, etc) and uses just a few MBs of RAM.)
$ hg clone https://bitbucket.org/vlatkoB/poomas && cd poomas && stack build
## open your system monitor
## open two terminals in 'poomas' dir and in one run
$ srvb.sh 5
## and in the other #
$ srvb.sh 6
## (5 and 6 represent port number added to 3000, i.e. 3005 and 3006)
## Notice that memory is steady, around 6 MB on my machine.
## In 'server/package.yaml' comment out the line 139 (#-with-rtsopts=-T)
$ stack build --force-dirty
## start those two servers again and see memory usage growing.
Can anyone shed some light what could be happening here?
Best regards,
vlatko
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