Hi Nikhil -
Thanks for the bug report. In this case, I think it's a minor issue,
since it appears that the leak is limited to these conditions:
* tuple unpacked in call (as you noted)
* tuple unpacked into global variables (i.e. not in a function)
In other words, this code doesn't seem to have the issue:
config const N=128;
const Ntot=N**3;
proc mkarray() {
var pos : [0.. #Ntot] real;
var vel : [0.. #Ntot] real;
return (pos, vel);
}
proc foo() {
var (a1,a2) = mkarray();
writeln("Done");
}
foo();
In any case I think it would be appropriate to file a .future about
this case. Are you interested in doing that?
Thanks,
-michael
On 3/29/16, 10:33 PM, "Nikhil Padmanabhan" <[email protected]>
wrote:
>Hi,
>
>
>I'm spotting a memory leak when I return a tuple of arrays, and attempt
>to unpack the tuple in the calling statement. An test code is below... If
>I replace the var (a1,a2)= .... statement in the code below with var a1
>=, the memory leak goes away.
>
>
>I'm not sure if I'm not allowed to unpack a tuple as I'm doing (but the
>compiler certainly lets me do it). This is, of course, easy to work
>around....
>
>
>Thanks in advance!
>-- Nikhil
>
>
>
>
>Specifically, consider the following Chapel code :
>
>
>config const N=128;
>const Ntot=N**3;
>proc mkarray() {
> var pos : [0.. #Ntot] real;
> var vel : [0.. #Ntot] real;
> return (pos, vel);
>}
>var (a1,a2) = mkarray();
>
>writeln("Done");
>
>
>
>compiled as :
> chpl -o tes_memleakt.x test_memleak.chpl
>
>
>run as :
> ./test_memleak.x --memTrack=true --memStats=true --memLeaks
>
>
>I get...
>Done
>
>
>=================
>Memory Statistics
>==============================================================
>Current Allocated Memory 33554944
>Maximum Simultaneous Allocated Memory 67110280
>Total Allocated Memory 100665032
>Total Freed Memory 67110088
>==============================================================
>
>
>==========================================================================
>=======================================
>Allocated Memory (Bytes) Number Size Total Description
> Address
>==========================================================================
>=======================================
>test_memleak.chpl:7 1 136 136
>[domain(1,int(64),false)] real(64)0x00007f5c6962d280
>test_memleak.chpl:7 1 136 136
>[domain(1,int(64),false)] real(64)0x00007f5c6962d320
>test_memleak.chpl:7 2097152 8 16777216 array
>elements 0x00007f5c5ee00000
>test_memleak.chpl:7 2097152 8 16777216 array
>elements 0x00007f5c5de00000
>test_memleak.chpl:5 1 96 96
>domain(1,int(64),false) 0x00007f5c6962a180
>test_memleak.chpl:6 1 96 96
>domain(1,int(64),false) 0x00007f5c6962a1e0
>test_memleak.chpl:7 1 24 24
>listNode(BaseArr) 0x00007f5c69619d80
>test_memleak.chpl:7 1 24 24
>listNode(BaseArr) 0x00007f5c69619d60
>==========================================================================
>=======================================
>
>
>
>
>
>
>---------------------------------
>Nikhil Padmanabhan
>[email protected]
>
>
>
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