Re: Strange behavior of "-with-rtsopts=-T

Hi Ömer, It doesn't require Postgres, I just haven't cleaned up the dependencies. My bad. :-( I pushed the cleaned version. However, noticed strange thing during testing of the cleaned package. There is no leak any more. And the problem is that I can't reproduce it, not even with previous commits. Without "-T", it does use double+ the memory (12-14 MB) than with "-T" (<5 MB), which is strange, but the memory doesn't grow any more. Will do more testing in the next few days. The only thing I can think of now is that I updated something in the environment. So, unless you're curious, there's no need to waste your time. Thanks for the offer, though. :-) br, vlatko On 06/06/2019 12:22, Ömer Sinan Ağacan wrote:

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, 5 Haz 2019 Çar, 12:53 tarihinde şunu yazdı:

...

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 clonehttps://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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