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Code Packages Activity

hash: remove the unused m_prefetch_rate_limit

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The hash table statistics calculation in BeesHashTable::prefetch_loop
and the data-driven operation of the extent scanner always pulls the
hash table into RAM as fast as the disk will push the data.  We never
use the prefetch rate limit, so remove it.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2017-01-11 20:56:13 -05:00
parent bddc07bd28
commit 5e91529ad2
2 changed files with 0 additions and 5 deletions
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4
src/bees-hash.cc
View File

@ -335,9 +335,6 @@ BeesHashTable::fetch_missing_extent(HashType hash)
}
BEESCOUNT(hash_extent_in);
// We don't block when fetching an extent but we do slow down the
// prefetch thread.
m_prefetch_rate_limit.borrow(BLOCK_SIZE_HASHTAB_EXTENT);
lock.lock();
m_buckets_missing.erase(extent_number);
}
@ -596,7 +593,6 @@ BeesHashTable::BeesHashTable(shared_ptr<BeesContext> ctx, string filename, off_t
m_writeback_thread("hash_writeback"),
m_prefetch_thread("hash_prefetch"),
m_flush_rate_limit(BEES_FLUSH_RATE),
m_prefetch_rate_limit(BEES_FLUSH_RATE),
m_stats_file(m_ctx->home_fd(), "beesstats.txt")
{
// Sanity checks to protect the implementation from its weaknesses

1
src/bees.h
View File

@ -444,7 +444,6 @@ private:
BeesThread m_writeback_thread;
BeesThread m_prefetch_thread;
RateLimiter m_flush_rate_limit;
RateLimiter m_prefetch_rate_limit;
mutex m_extent_mutex;
mutex m_bucket_mutex;
condition_variable m_condvar;