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Fix issues for reproducing synthetic ZippyDB workloads in the FAST20' paper (#6795)

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Summary:
Fix issues for reproducing synthetic ZippyDB workloads in the FAST20' paper using db_bench. Details changes as follows.
1, add a separate random mode in MixGraph to produce all_random workload.
2, fix power inverse function for generating prefix_dist workload.
3, make sure key_offset in prefix mode is always unsigned.
note: Need to carefully choose key_dist_a/b to avoid aliasing. Power inverse function range should be close to overall key space.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6795

Reviewed By: akankshamahajan15

Differential Revision: D21371095

Pulled By: zhichao-cao

fbshipit-source-id: 80744381e242392c8c7cf8ac3d68fe67fe876048
This commit is contained in:
Mian Qin 2020-05-04 10:53:15 -07:00 committed by Facebook GitHub Bot
parent 211088df6e
commit d9e170d82b
1 changed files with 12 additions and 4 deletions
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16
tools/db_bench_tool.cc
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@ -5415,13 +5415,15 @@ class Benchmark {
// Select one key in the key-range and compose the keyID
int64_t key_offset = 0, key_seed;
if (key_dist_a == 0.0 && key_dist_b == 0.0) {
if (key_dist_a == 0.0 || key_dist_b == 0.0) {
key_offset = ini_rand % keyrange_size_;
} else {
double u =
static_cast<double>(ini_rand % keyrange_size_) / keyrange_size_;
key_seed = static_cast<int64_t>(
ceil(std::pow((ini_rand / key_dist_a), (1 / key_dist_b))));
ceil(std::pow((u / key_dist_a), (1 / key_dist_b))));
Random64 rand_key(key_seed);
key_offset = static_cast<int64_t>(rand_key.Next()) % keyrange_size_;
key_offset = rand_key.Next() % keyrange_size_;
}
return keyrange_size_ * keyrange_id + key_offset;
}
@ -5448,6 +5450,7 @@ class Benchmark {
double write_rate = 1000000.0;
double read_rate = 1000000.0;
bool use_prefix_modeling = false;
bool use_random_modeling = false;
GenerateTwoTermExpKeys gen_exp;
std::vector<double> ratio{FLAGS_mix_get_ratio, FLAGS_mix_put_ratio,
FLAGS_mix_seek_ratio};
@ -5482,6 +5485,9 @@ class Benchmark {
FLAGS_num, FLAGS_keyrange_dist_a, FLAGS_keyrange_dist_b,
FLAGS_keyrange_dist_c, FLAGS_keyrange_dist_d);
}
if (FLAGS_key_dist_a == 0 || FLAGS_key_dist_b == 0) {
use_random_modeling = true;
}
Duration duration(FLAGS_duration, reads_);
while (!duration.Done(1)) {
@ -5492,7 +5498,9 @@ class Benchmark {
double u = static_cast<double>(rand_v) / FLAGS_num;
// Generate the keyID based on the key hotness and prefix hotness
if (use_prefix_modeling) {
if (use_random_modeling) {
key_rand = ini_rand;
} else if (use_prefix_modeling) {
key_rand =
gen_exp.DistGetKeyID(ini_rand, FLAGS_key_dist_a, FLAGS_key_dist_b);
} else {