Speeding up compilation by using jemalloc

[weaselcat via Digitalmars-d]

On Thursday, 22 January 2015 at 19:37:11 UTC, weaselcat wrote:
> Might be of use to someone, but I was looking for ways to speed 
> up dmd's albeit already fast compilation times.
>
> Just by dropping in jemalloc in place of glibc's malloc via 
> LD_PRELOAD on my linux machine I saw a 10-15% drop in 
> compilation times across the board. Not sure if this is common 
> knowledge or not.
>
> (Sorry if this takes away from your coffee time : ) )

I had some time to bench it on a project not mine

I used vibe.d BTW

avgtime -d -q -r10 dub build --compiler=dmd --force

------------------------
Total time (ms): 73167.1
Repetitions    : 10
Sample mode    : 7290 (3 ocurrences)
Median time    : 7300.78
Avg time       : 7316.71
Std dev.       : 32.5878
Minimum        : 7281.8
Maximum        : 7385.81
95% conf.int.  : [7252.84, 7380.59]  e = 63.871
99% conf.int.  : [7232.77, 7400.65]  e = 83.9407
EstimatedAvg95%: [7296.52, 7336.91]  e = 20.1978
EstimatedAvg99%: [7290.17, 7343.26]  e = 26.5444

LD_PRELOAD=/usr/lib/libjemalloc.so avgtime -d -q -r10 dub build 
--compiler=dmd --force

------------------------
Total time (ms): 64026.4
Repetitions    : 10
Sample mode    : 6390 (3 ocurrences)
Median time    : 6399.68
Avg time       : 6402.64
Std dev.       : 18.3341
Minimum        : 6365.8
Maximum        : 6431.14
95% conf.int.  : [6366.7, 6438.57]  e = 35.9342
99% conf.int.  : [6355.41, 6449.86]  e = 47.2256
EstimatedAvg95%: [6391.27, 6414]  e = 11.3634
EstimatedAvg99%: [6387.7, 6417.57]  e = 14.934



p.s., avgtime from dub is a nice tool.