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Win32 import batchsize tweaks 

Reduce frequency of resizes: bump minimum increase from 128MB to 512MB
Use a bigger safety margin at small batch sizes
This commit is contained in:
Howard Chu 2016-02-14 19:31:52 +00:00
parent 2b5e155816
commit bf22109d16
1 changed files with 6 additions and 3 deletions
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9
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -428,7 +428,7 @@ void BlockchainLMDB::check_and_resize_for_batch(uint64_t batch_num_blocks)
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
LOG_PRINT_L1("[" << __func__ << "] " << "checking DB size");
const uint64_t min_increase_size = 128 * (1 << 20);
const uint64_t min_increase_size = 512 * (1 << 20);
uint64_t threshold_size = 0;
uint64_t increase_size = 0;
if (batch_num_blocks > 0)
@ -464,6 +464,7 @@ uint64_t BlockchainLMDB::get_estimated_batch_size(uint64_t batch_num_blocks) con
// batch size estimate * batch safety factor = final size estimate
// Takes into account "reasonable" block size increases in batch.
float batch_safety_factor = 1.7f;
float batch_fudge_factor = batch_safety_factor * batch_num_blocks;
// estimate of stored block expanded from raw block, including denormalization and db overhead.
// Note that this probably doesn't grow linearly with block size.
float db_expand_factor = 4.5f;
@ -502,8 +503,10 @@ uint64_t BlockchainLMDB::get_estimated_batch_size(uint64_t batch_num_blocks) con
avg_block_size = min_block_size;
LOG_PRINT_L1("estimated average block size for batch: " << avg_block_size);
threshold_size = avg_block_size * db_expand_factor * batch_num_blocks;
threshold_size = threshold_size * batch_safety_factor;
// bigger safety margin on smaller block sizes
if (batch_fudge_factor < 5000.0)
batch_fudge_factor = 5000.0;
threshold_size = avg_block_size * db_expand_factor * batch_fudge_factor;
return threshold_size;
}