On Friday, 7 August 2015 at 09:12:32 UTC, yawniek wrote:
On Friday, 7 August 2015 at 08:50:11 UTC, Daniel Kozák wrote:
> ldc[2] -O -release -boundscheck=off -singleobj app.d
ldc 0.15.2 beta2
2.86s user 0.55s system 77% cpu 4.392 total
v2.068-devel-8f81ffc
2.86s user 0.67s system 78% cpu 4.476 total
v2.067
2.88s user 0.67s system 78% cpu 4.529 total
i can now reproduce the results and indeed, its faster than
zcat:
on a c4.xlarge aws instance running archlinux and dmd v2.067
same file as above on my macbook.
best run: 2.72s user 0.39s system 99% cpu 3.134 total
worst run: 3.47s user 0.46s system 99% cpu 3.970 total
zcat:
best: 4.45s user 0.28s system 99% cpu 4.764 total
worst: 4.99s user 0.57s system 99% cpu 5.568 total
so i guess on os x there is still something to be optimized
Can you try it without write operation (comment out all write)?
And than try it without uncompression?
// without compression:
void main(string[] args)
{
auto f = File(args[1], "r");
foreach (buffer; f.byChunk(4096))
{
write(cast(char[])buffer);
}
}
// without write:
void main(string[] args)
{
auto f = File(args[1], "r");
auto uncompressor = new UnCompress(HeaderFormat.gzip);
foreach (buffer; f.byChunk(4096))
{
auto uncompressed =
cast(char[])(uncompressor.uncompress(buffer));
}
uncompressor.flush;
}
