I see that Dan Doel's post favoring Ptr/Addr#
has the same allocation amounts (from +RTS -sstderr) for Ptr/Addr# and the
MutableByteArray#
Everyone else sees more allocation for Ptr/Addr# than MBA# and see MBA# as
faster in these cases.
I myself (on G4) see more allocation [just like Simon Marlow] for Ptr/Addr# and
find it slower. If I boost the initial memory with "-A 100m" then Ptr still
allocated more, but the timing difference becomes quite small:
The Ptr/Addr# code now runs in:
pamac-cek10:tmp chrisk$ time ./addr 100 1000000 +RTS -sstderr -A100m
./a 100 1000000 +RTS -sstderr -A100m
Done.
48,182,068 bytes allocated in the heap
276 bytes copied during GC (scavenged)
0 bytes copied during GC (not scavenged)
20,480 bytes maximum residency (1 sample(s))
1 collections in generation 0 ( 0.00s)
1 collections in generation 1 ( 0.00s)
97 Mb total memory in use
INIT time 0.00s ( 0.01s elapsed)
MUT time 1.54s ( 2.43s elapsed)
GC time 0.00s ( 0.00s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 1.55s ( 2.44s elapsed)
%GC time 0.2% (0.1% elapsed)
Alloc rate 31,205,254 bytes per MUT second
Productivity 99.6% of total user, 63.1% of total elapsed
real 0m2.728s
user 0m1.548s
sys 0m0.207s
And the MutableByteArray# code now runs in:
pamac-cek10:tmp chrisk$ time ./mba 100 1000000 +RTS -sstderr -A100m
./m 100 1000000 +RTS -sstderr -A100m
Done.
4,023,784 bytes allocated in the heap
276 bytes copied during GC (scavenged)
0 bytes copied during GC (not scavenged)
20,480 bytes maximum residency (1 sample(s))
1 collections in generation 0 ( 0.00s)
1 collections in generation 1 ( 0.00s)
101 Mb total memory in use
INIT time 0.00s ( 0.01s elapsed)
MUT time 1.50s ( 2.30s elapsed)
GC time 0.00s ( 0.00s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 1.51s ( 2.32s elapsed)
%GC time 0.3% (0.2% elapsed)
Alloc rate 2,668,201 bytes per MUT second
Productivity 99.6% of total user, 65.0% of total elapsed
real 0m2.335s
user 0m1.513s
sys 0m0.049s
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