gistfile1.txt

# When some levels are compresseion (db_bench --min_level_to_compress=2 --compression_type=lz4) 
# then compaction IO stats are easier to explain with dynamic leveled disabled by
# --level_compaction_dynamic_level_bytes=false. First, the level names displayed in the stats
# are L0,L1,L2 and L3 vs L0,L4,L5 and L6 when dynamic leveled was enabled. Second, for each
# level either Write(GB)=0 or Moved(GB)=0. With dynamic leveled they could both be non-zero.

M1=$(( 1024 * 1024 )); ./db_bench --benchmarks=fillseq,stats \
 --db_write_buffer_size=$(( $M1 * 8 )) \
 --target_file_size_base=$(( $M1 * 8 )) \
 --max_bytes_for_level_base=$(( $M1 * 32 )) \
 --level0_file_num_compaction_trigger=4 \
 --level0_slowdown_writes_trigger=20 \
 --level0_stop_writes_trigger=30 \
 --level_compaction_dynamic_level_bytes=false \
 --num=$(( $M1 * 16 )) \
 --min_level_to_compress=2 \
 --compression_type=lz4

Set seed to 1648995927893027 because --seed was 0
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
RocksDB:    version 7.1
Date:       Sun Apr  3 07:25:28 2022
CPU:        32 * Intel Xeon Processor (Skylake)
CPUCache:   16384 KB
Keys:       16 bytes each (+ 0 bytes user-defined timestamp)
Values:     100 bytes each (50 bytes after compression)
Entries:    16777216
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    1856.0 MB (estimated)
FileSize:   1056.0 MB (estimated)
Write rate: 0 bytes/second
Read rate: 0 ops/second
Compression: LZ4
Compression sampling rate: 0
Memtablerep: SkipListFactory
Perf Level: 1
------------------------------------------------
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
DB path: [/tmp/rocksdbtest-2260/dbbench]
fillseq      :       4.125 micros/op 242405 ops/sec;   26.8 MB/s


** Compaction Stats [default] **
Level    Files   Size     Score Read(GB)  Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  L0      3/0   15.13 MB   0.8      0.0     0.0      0.0       1.9      1.9       0.0   1.0      0.0    141.4     13.77              6.64       386    0.036       0      0       0.0       0.0
  L1      6/0   30.25 MB   0.9      0.0     0.0      0.0       0.0      0.0       1.9   0.0      0.0      0.0      0.00              0.00         0    0.000       0      0       0.0       0.0
  L2    121/0   319.09 MB   1.0      1.9     1.9      0.0       1.0      1.0       0.0   0.5    138.1     72.2     13.77             12.85       377    0.037     16M      0       0.0       0.0
  L3    256/0   675.08 MB   0.2      0.0     0.0      0.0       0.0      0.0       0.7   0.0      0.0      0.0      0.00              0.00         0    0.000       0      0       0.0       0.0
 Sum    386/0    1.02 GB   0.0      1.9     1.9      0.0       2.9      2.9       2.5   1.5     69.0    106.8     27.53             19.49       763    0.036     16M      0       0.0       0.0
 Int      0/0    0.00 KB   0.0      1.8     1.8      0.0       2.8      2.8       2.5   1.5     69.7    106.2     26.76             18.97       740    0.036     16M      0       0.0       0.0

** Compaction Stats [default] **
Priority    Files   Size     Score Read(GB)  Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Low      0/0    0.00 KB   0.0      1.9     1.9      0.0       1.0      1.0       0.0   0.0    138.1     72.2     13.77             12.85       377    0.037     16M      0       0.0       0.0
High      0/0    0.00 KB   0.0      0.0     0.0      0.0       1.9      1.9       0.0   0.0      0.0    141.4     13.77              6.64       386    0.036       0      0       0.0       0.0

Blob file count: 0, total size: 0.0 GB, garbage size: 0.0 GB, space amp: 0.0

Uptime(secs): 69.2 total, 66.2 interval
Flush(GB): cumulative 1.901, interval 1.822
AddFile(GB): cumulative 0.000, interval 0.000
AddFile(Total Files): cumulative 0, interval 0
AddFile(L0 Files): cumulative 0, interval 0
AddFile(Keys): cumulative 0, interval 0
Cumulative compaction: 2.87 GB write, 42.48 MB/s write, 1.86 GB read, 27.46 MB/s read, 27.5 seconds
Interval compaction: 2.77 GB write, 42.91 MB/s write, 1.82 GB read, 28.18 MB/s read, 26.8 seconds
Stalls(count): 0 level0_slowdown, 0 level0_slowdown_with_compaction, 0 level0_numfiles, 0 level0_numfiles_with_compaction, 0 stop for pending_compaction_bytes, 0 slowdown for pending_compaction_bytes, 0 memtable_compaction, 0 memtable_slowdown, interval 0 total count
Block cache LRUCache@0x7f610e629290#2403666 capacity: 8.00 MB collections: 1 last_copies: 1 last_secs: 0.000113 secs_since: 69
Block cache entry stats(count,size,portion): WriteBuffer(1,256.00 KB,3.125%) Misc(1,0.00 KB,0%)

** File Read Latency Histogram By Level [default] **

** DB Stats **
Uptime(secs): 69.2 total, 66.2 interval
Cumulative writes: 16M writes, 16M keys, 16M commit groups, 1.0 writes per commit group, ingest: 2.05 GB, 30.28 MB/s
Cumulative WAL: 16M writes, 0 syncs, 16777216.00 writes per sync, written: 2.05 GB, 30.28 MB/s
Cumulative stall: 00:00:0.000 H:M:S, 0.0 percent
Interval writes: 16M writes, 16M keys, 16M