Alright, I am pretty certain that
macro nogc(ex)
quote
try
gc_disable()
local val = $(esc(ex))
finally
gc_enable()
end
val
end
end
Does the trick...
My program does an iterative "gradient descent", a kind of mathematical
optimisation algorithm. So I loop through a for loop multiple times. In
each loop, nothing gets created or destroyed, so GC is not needed at all.
It turns out that turning off GC improves the performance significantly,
probably 100x. This issue is serious, I wonder can there be a better way of
determining when to call GC. I guessed disabling GC manually is not the
intention of the compiler designers..
On Tuesday, April 1, 2014 11:12:07 PM UTC+8, Freddy Chua wrote:
>
> I found this,
> https://groups.google.com/forum/#!searchin/julia-users/garbage/julia-users/6_XvoLBzN60/EHCrT46tIQYJ
>
> Might try to turn off GC and see whether performance improves, will update
> here later...
>
> On Tuesday, April 1, 2014 11:07:03 PM UTC+8, Stefan Karpinski wrote:
>>
>> This code doesn't seem to create a List, Nodes or insert them into a Dict
>> – it just walks over a preexisting linked list.
>>
>>
>> On Tue, Apr 1, 2014 at 10:59 AM, Freddy Chua <[email protected]> wrote:
>>
>>> A possible flaw I have is the circular dependency in the data structures
>>> between Bus_Stop and Edge.
>>>
>>
>>
