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[thin_metadata_pack] Prefetch blocks.

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Doubles performance
This commit is contained in:
Joe Thornber 2020-06-01 11:13:51 +01:00
parent 128ecc27f2
commit 9f2b747ffa
1 changed files with 9 additions and 0 deletions
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9
thin-provisioning/thin_metadata_pack.cc
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@ -42,6 +42,7 @@ namespace {
using namespace std;
constexpr uint64_t MAGIC = 0xa537a0aa6309ef77;
constexpr uint64_t PACK_VERSION = 1;
constexpr uint64_t PREFETCH_COUNT = 1024;
uint32_t const SUPERBLOCK_CSUM_SEED = 160774;
uint32_t const BITMAP_CSUM_XOR = 240779;
@ -132,6 +133,10 @@ namespace {
write_u64(out, block_size);
write_u64(out, nr_blocks);
// prefetch
for (block_address b = 0; b < PREFETCH_COUNT; b++)
bm->prefetch(b);
is_metadata_functor is_metadata;
for (block_address b = 0; b < nr_blocks; b++) {
auto rr = bm->read_lock(b);
@ -140,6 +145,10 @@ namespace {
write_u64(out, b);
out.write(reinterpret_cast<const char *>(rr.data()), block_size);
}
auto prefetch_b = b + PREFETCH_COUNT;
if (prefetch_b < nr_blocks)
bm->prefetch(prefetch_b);
}
return 0;