| typora-copy-images-to |
|---|
../crdb_vs_tidb |
- crdb，tidb 各三台物理机，40core, 252GiB, 4T * 6
以下均使用 sysbench（以下简称sb） 作为压测工具。
oltp_insert.sh，每次 insert 一条数据。
- PK自增的 insert 场景
| tidb 节点个数 | qps | 95th latency | max latency |
|---|---|---|---|
| 1 | 5556 | 3.3 | 1152 |
| 2 | 3818 + 3764 | 5.6 | 1675 |
| 3 | 3040 + 3081 + 3062 | 7.1 | 1568 |
env tables=8 events=1000000 ./oltp_insert.sh
SQL statistics:
queries performed:
read: 0
write: 1000000
other: 0
total: 1000000
transactions: 1000000 (5556.77 per sec.)
queries: 1000000 (5556.77 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 179.9585s
total number of events: 1000000
Latency (ms):
min: 1.40
avg: 2.88
max: 1152.24
95th percentile: 3.30
sum: 2878281.61
Threads fairness:
events (avg/stddev): 62500.0000/99.39
execution time (avg/stddev): 179.8926/0.01
env tables=8 events=10000000 ./oltp_insert.sh
## 1
SQL statistics:
queries performed:
read: 0
write: 10000000
other: 0
total: 10000000
transactions: 10000000 (3818.39 per sec.)
queries: 10000000 (3818.39 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 2618.9054s
total number of events: 10000000
Latency (ms):
min: 1.43
avg: 4.19
max: 1675.88
95th percentile: 5.67
sum: 41892327.51
Threads fairness:
events (avg/stddev): 625000.0000/613.97
execution time (avg/stddev): 2618.2705/0.04
## 2
SQL statistics:
queries performed:
read: 0
write: 10000000
other: 0
total: 10000000
transactions: 10000000 (3764.72 per sec.)
queries: 10000000 (3764.72 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 2656.2413s
total number of events: 10000000
Latency (ms):
min: 1.47
avg: 4.25
max: 1675.93
95th percentile: 5.57
sum: 42472993.19
Threads fairness:
events (avg/stddev): 625000.0000/648.66
execution time (avg/stddev): 2654.5621/0.05
### env tables=8 events=2000000 ./oltp_insert.sh
## 1
SQL statistics:
queries performed:
read: 0
write: 2000000
other: 0
total: 2000000
transactions: 2000000 (3040.78 per sec.)
queries: 2000000 (3040.78 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 657.7238s
total number of events: 2000000
Latency (ms):
min: 1.55
avg: 5.26
max: 1567.64
95th percentile: 7.04
sum: 10517924.68
Threads fairness:
events (avg/stddev): 125000.0000/245.01
execution time (avg/stddev): 657.3703/0.01
## 2
SQL statistics:
queries performed:
read: 0
write: 2000000
other: 0
total: 2000000
transactions: 2000000 (3081.35 per sec.)
queries: 2000000 (3081.35 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 649.0643s
total number of events: 2000000
Latency (ms):
min: 1.47
avg: 5.19
max: 1569.35
95th percentile: 7.17
sum: 10382837.10
Threads fairness:
events (avg/stddev): 125000.0000/216.78
execution time (avg/stddev): 648.9273/0.01
## 3
SQL statistics:
queries performed:
read: 0
write: 2000000
other: 0
total: 2000000
transactions: 2000000 (3062.69 per sec.)
queries: 2000000 (3062.69 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 653.0184s
total number of events: 2000000
Latency (ms):
min: 1.53
avg: 5.22
max: 1568.29
95th percentile: 7.04
sum: 10442703.77
Threads fairness:
events (avg/stddev): 125000.0000/148.39
execution time (avg/stddev): 652.6690/0.01
- PK随机的 insert 场景
- 待完善，一个简单的测试结果如下
> env tables=8 events=3000000 auto_inc=off ./oltp_insert.sh
SQL statistics:
queries performed:
read: 0
write: 3000000
other: 0
total: 3000000
transactions: 3000000 (6149.80 per sec.)
queries: 3000000 (6149.80 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 487.8185s
total number of events: 3000000
Latency (ms):
min: 1.40
avg: 2.60
max: 11954.60
95th percentile: 2.97
sum: 7801022.79
Threads fairness:
events (avg/stddev): 187500.0000/323.36
execution time (avg/stddev): 487.5639/0.02
一个表一个线程，批量去写。共 16 个表。
INSERT INTO %s (k, c, pad) VALUES(%d, '%s', '%s'), (%d, '%s', '%s')...
| bench 个数 | tps/qps | avg/95% latency | max latency |
|---|---|---|---|
| 1 | 29454/11 | 0.54/0.01 | 25413 |
| 3 | (15188+15620+ 15768)/(5.68+ 5.85+5.9) | 1.01/0.01 | 58914 |
IO是瓶颈
> env mysql_db=oltp_read_only tables=16 table_size=2000000 threads=16 events=16000000 ./oltp_batch_insert.sh
SQL statistics:
queries performed:
read: 0
write: 5988
other: 0
total: 5988
transactions: 16000000 (29454.05 per sec.)
queries: 5988 (11.02 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 543.2169s
total number of events: 16000000
Latency (ms):
min: 0.01
avg: 0.54
max: 25413.24
95th percentile: 0.01
sum: 8672438.36
Threads fairness:
events (avg/stddev): 1000000.0000/614913.86
execution time (avg/stddev): 542.0274/0.64
-------------
IO 基本已经跑满。
> env mysql_db=oltp_read_only tables=16 table_size=2000000 threads=16 events=16000000 ./oltp_batch_insert.sh
## 1
SQL statistics:
queries performed:
read: 0
write: 5988
other: 0
total: 5988
transactions: 16000000 (15188.84 per sec.)
queries: 5988 (5.68 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 1053.4025s
total number of events: 16000000
Latency (ms):
min: 0.01
avg: 1.05
max: 44627.51
95th percentile: 0.01
sum: 16832525.03
Threads fairness:
events (avg/stddev): 1000000.0000/719049.97
execution time (avg/stddev): 1052.0328/0.54
## 2
SQL statistics:
queries performed:
read: 0
write: 5988
other: 0
total: 5988
transactions: 16000000 (15620.93 per sec.)
queries: 5988 (5.85 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 1024.2645s
total number of events: 16000000
Latency (ms):
min: 0.01
avg: 1.02
max: 58914.36
95th percentile: 0.01
sum: 16357943.95
Threads fairness:
events (avg/stddev): 1000000.0000/767703.42
execution time (avg/stddev): 1022.3715/0.45
## 3
SQL statistics:
queries performed:
read: 0
write: 5988
other: 0
total: 5988
transactions: 16000000 (15768.15 per sec.)
queries: 5988 (5.90 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 1014.7015s
total number of events: 16000000
Latency (ms):
min: 0.01
avg: 1.01
max: 49112.71
95th percentile: 0.01
sum: 16142005.78
Threads fairness:
events (avg/stddev): 1000000.0000/692012.93
execution time (avg/stddev): 1008.8754/2.38
SELECT c FROM sbtest%u WHERE id=?
cmd: env mysql_db=oltp_read_only tables=16 table_size=2000000 threads=16 events=10000000 ./oltp_point_select.sh
| bench num | qps | 95% | avg | max |
|---|---|---|---|---|
| 1 | 26525 | 0.77 | 0.60 | 38.6 |
| 2 | 23100 + 23132 | 1.0 | 0.69 | 29 |
| 3 | 20008+20066+20334 | 1.3 | 0.8 | 157 |
基本上 point select 吞吐量线性增长。这里不多说了
one bench:
SQL statistics:
queries performed:
read: 10000000
write: 0
other: 0
total: 10000000
transactions: 10000000 (26525.05 per sec.)
queries: 10000000 (26525.05 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 376.9999s
total number of events: 10000000
Latency (ms):
min: 0.36
avg: 0.60
max: 38.62
95th percentile: 0.77
sum: 6027872.54
Threads fairness:
events (avg/stddev): 625000.0000/748.73
execution time (avg/stddev): 376.7420/0.02
two bench:
## 1
SQL statistics:
queries performed:
read: 10000000
write: 0
other: 0
total: 10000000
transactions: 10000000 (23100.05 per sec.)
queries: 10000000 (23100.05 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 432.8974s
total number of events: 10000000
Latency (ms):
min: 0.38
avg: 0.69
max: 29.11
95th percentile: 1.08
sum: 6922301.16
Threads fairness:
events (avg/stddev): 625000.0000/742.81
execution time (avg/stddev): 432.6438/0.02
## 2
SQL statistics:
queries performed:
read: 10000000
write: 0
other: 0
total: 10000000
transactions: 10000000 (23132.86 per sec.)
queries: 10000000 (23132.86 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 432.2832s
total number of events: 10000000
Latency (ms):
min: 0.36
avg: 0.69
max: 24.71
95th percentile: 0.95
sum: 6905746.65
Threads fairness:
events (avg/stddev): 625000.0000/896.61
execution time (avg/stddev): 431.6092/0.04
## 1
SQL statistics:
queries performed:
read: 10000000
write: 0
other: 0
total: 10000000
transactions: 10000000 (20066.69 per sec.)
queries: 10000000 (20066.69 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 498.3362s
total number of events: 10000000
Latency (ms):
min: 0.39
avg: 0.80
max: 156.28
95th percentile: 1.23
sum: 7961690.59
Threads fairness:
events (avg/stddev): 625000.0000/2393.90
execution time (avg/stddev): 497.6057/0.08
## 2
SQL statistics:
queries performed:
read: 10000000
write: 0
other: 0
total: 10000000
transactions: 10000000 (20008.68 per sec.)
queries: 10000000 (20008.68 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 499.7810s
total number of events: 10000000
Latency (ms):
min: 0.37
avg: 0.80
max: 157.03
95th percentile: 1.32
sum: 7985976.16
Threads fairness:
events (avg/stddev): 625000.0000/1786.62
execution time (avg/stddev): 499.1235/0.08
## 3
SQL statistics:
queries performed:
read: 10000000
write: 0
other: 0
total: 10000000
transactions: 10000000 (20334.82 per sec.)
queries: 10000000 (20334.82 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 491.7651s
total number of events: 10000000
Latency (ms):
min: 0.38
avg: 0.79
max: 157.20
95th percentile: 1.39
sum: 7863746.09
Threads fairness:
events (avg/stddev): 625000.0000/797.55
execution time (avg/stddev): 491.4841/0.02
每次顺序执行以下操作：（range 起始随机生成，range size 指定）
- simple range:
SELECT c FROM sbtest%u WHERE id BETWEEN ? AND ? - sum range:
SELECT SUM(k) FROM sbtest%u WHERE id BETWEEN ? AND ? - order range:
SELECT c FROM sbtest%u WHERE id BETWEEN ? AND ? ORDER BY c - distinct order range:
SELECT DISTINCT c FROM sbtest%u WHERE id BETWEEN ? AND ? ORDER BY c
变量:
- range size
- trx
env mysql_db=oltp_read_only tables=6 table_size=10000000 threads=64 events=1000000 range_size=1000 skip_trx=off ./oltp_read_only.sh
range_size=1000, trx=off
SQL statistics:
queries performed:
read: 14000000
write: 0
other: 2000000
total: 16000000
transactions: 1000000 (530.30 per sec.)
queries: 16000000 (8484.87 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 1885.7079s
total number of events: 1000000
Latency (ms):
min: 30.13
avg: 120.68
max: 643.98
95th percentile: 170.48
sum: 120679713.44
Threads fairness:
events (avg/stddev): 15625.0000/28.34
execution time (avg/stddev): 1885.6205/0.02
SQL statistics:
queries performed:
read: 14000000
write: 0
other: 2000000
total: 16000000
transactions: 1000000 (540.90 per sec.)
queries: 16000000 (8654.34 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 1848.7804s
total number of events: 1000000
Latency (ms):
min: 25.67
avg: 118.31
max: 593.37
95th percentile: 164.45
sum: 118314359.31
Threads fairness:
events (avg/stddev): 15625.0000/40.41
execution time (avg/stddev): 1848.6619/0.03
SQL statistics:
queries performed:
read: 14000000
write: 0
other: 2000000
total: 16000000
transactions: 1000000 (417.96 per sec.)
queries: 16000000 (6687.32 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 2392.5862s
total number of events: 1000000
Latency (ms):
min: 23.05
avg: 153.12
max: 686.26
95th percentile: 287.38
sum: 153119455.87
Threads fairness:
events (avg/stddev): 15625.0000/32.48
execution time (avg/stddev): 2392.4915/0.02
通过索引 random N个 point 出来。
SELECT id, k, c, pad FROM sbtest1 WHERE k IN (%s)
变量：
- random_points
env mysql_db=oltp_read_only table_size=10000000 threads=64 events=100000 random_points=1000 ./oltp_select_random_points.sh
random_points=1000
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (405.70 per sec.)
queries: 100000 (405.70 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 246.4860s
total number of events: 100000
Latency (ms):
min: 63.07
avg: 157.72
max: 436.95
95th percentile: 211.60
sum: 15772122.53
Threads fairness:
events (avg/stddev): 1562.5000/131.76
execution time (avg/stddev): 246.4394/0.03
现象：
- tikv 显示 index wait 有5ms。table wait 有不到1ms。
- tikv CPU 到 1000%。
- index 集中在一个 store 里。
## 1
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (205.84 per sec.)
queries: 100000 (205.84 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 485.8233s
total number of events: 100000
Latency (ms):
min: 148.75
avg: 310.85
max: 670.72
95th percentile: 502.20
sum: 31084962.80
Threads fairness:
events (avg/stddev): 1562.5000/218.77
execution time (avg/stddev): 485.7025/0.06
## 2
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (205.59 per sec.)
queries: 100000 (205.59 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 486.4009s
total number of events: 100000
Latency (ms):
min: 135.17
avg: 311.08
max: 654.32
95th percentile: 502.20
sum: 31107876.61
Threads fairness:
events (avg/stddev): 1562.5000/218.85
execution time (avg/stddev): 486.0606/0.11
## 3
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (198.55 per sec.)
queries: 100000 (198.55 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 503.6546s
total number of events: 100000
Latency (ms):
min: 72.47
avg: 322.31
max: 717.04
95th percentile: 520.62
sum: 32230945.30
Threads fairness:
events (avg/stddev): 1562.5000/208.81
execution time (avg/stddev): 503.6085/0.03
现象：
- tikv 显示 index wait 大概有250ms。table wait 大概有 20ms。
- tikv CPU 到 2500%。
- index 集中在一个 store 里。
多个 range 组合： SELECT count(k) FROM sbtest1 WHERE (k BETWEEN ? AND ?) OR (k BETWEEN ? AND ?) OR (k BETWEEN ? AND ?) ...
变量：
- number_of_ranges
- range_size
env mysql_db=oltp_read_only table_size=10000000 threads=64 events=100000 number_of_ranges=10 delta=100 ./oltp_select_random_ranges.sh
number_of_ranges=10, range_size=100
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (4280.62 per sec.)
queries: 100000 (4280.62 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 23.3590s
total number of events: 100000
Latency (ms):
min: 2.96
avg: 14.93
max: 168.93
95th percentile: 25.74
sum: 1492807.42
Threads fairness:
events (avg/stddev): 1562.5000/163.47
execution time (avg/stddev): 23.3251/0.00
number_of_ranges=50, range_size=100
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (786.68 per sec.)
queries: 100000 (786.68 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 127.1141s
total number of events: 100000
Latency (ms):
min: 17.17
avg: 81.34
max: 424.49
95th percentile: 123.28
sum: 8134102.90
Threads fairness:
events (avg/stddev): 1562.5000/113.90
execution time (avg/stddev): 127.0954/0.01
number_of_ranges=100, range_size=100
SQL statistics:
queries performed:
read: 100000
write: 0
other: 0
total: 100000
transactions: 100000 (360.02 per sec.)
queries: 100000 (360.02 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 277.7583s
total number of events: 100000
Latency (ms):
min: 65.19
avg: 177.67
max: 630.01
95th percentile: 253.35
sum: 17767029.96
Threads fairness:
events (avg/stddev): 1562.5000/103.37
execution time (avg/stddev): 277.6098/0.04
思考:
- 对于连续 skip scan 的查询，比较耗费CPU。这是 rocksdb 和磁盘本身性质决定的。
UPDATE sbtest%u SET k=k+1 WHERE id=?
随机生成 id，更新它的索引值 k。（只更新一张表）
env mysql_db=oltp_read_only tables=1 table_size=70000000 threads=128 events=1000000 ./oltp_update_index.sh
SQL statistics:
queries performed:
read: 0
write: 1000000
other: 0
total: 1000000
transactions: 1000000 (11359.39 per sec.)
queries: 1000000 (11359.39 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 88.0308s
total number of events: 1000000
Latency (ms):
min: 1.81
avg: 11.27
max: 4438.94
95th percentile: 19.65
sum: 11266034.93
Threads fairness:
events (avg/stddev): 7812.5000/91.92
execution time (avg/stddev): 88.0159/0.00
## 1
SQL statistics:
queries performed:
read: 0
write: 400000
other: 0
total: 400000
transactions: 400000 (4595.58 per sec.)
queries: 400000 (4595.58 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 87.0380s
total number of events: 400000
Latency (ms):
min: 1.90
avg: 27.83
max: 4623.44
95th percentile: 43.39
sum: 11132064.35
Threads fairness:
events (avg/stddev): 3125.0000/35.11
execution time (avg/stddev): 86.9693/0.01
SQL statistics:
queries performed:
read: 0
write: 400000
other: 0
total: 400000
transactions: 400000 (4651.90 per sec.)
queries: 400000 (4651.90 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
## 2
General statistics:
total time: 85.9841s
total number of events: 400000
Latency (ms):
min: 1.97
avg: 27.51
max: 5362.06
95th percentile: 41.85
sum: 11003196.75
Threads fairness:
events (avg/stddev): 3125.0000/42.66
execution time (avg/stddev): 85.9625/0.01
## 3
SQL statistics:
queries performed:
read: 0
write: 400000
other: 0
total: 400000
transactions: 400000 (4687.66 per sec.)
queries: 400000 (4687.66 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 85.3282s
total number of events: 400000
Latency (ms):
min: 1.93
avg: 27.28
max: 5702.88
95th percentile: 42.61
sum: 10912419.58
Threads fairness:
events (avg/stddev): 3125.0000/46.31
execution time (avg/stddev): 85.2533/0.01
此时出现prepare_write error，写竞争了，观察 pending task 也是有的。
再往上压，延迟增加，pending task 增加。
UPDATE sbtest%u SET c=? WHERE id=?
随机生成 id，更新它的值 c。（只更新一张表）
env mysql_db=oltp_read_only tables=1 table_size=70000000 threads=128 events=1000000 ./oltp_update_non_index.sh
SQL statistics:
queries performed:
read: 0
write: 1000000
other: 0
total: 1000000
transactions: 1000000 (15034.36 per sec.)
queries: 1000000 (15034.36 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 66.5122s
total number of events: 1000000
Latency (ms):
min: 1.65
avg: 8.48
max: 668.80
95th percentile: 13.46
sum: 8484868.18
Threads fairness:
events (avg/stddev): 7812.5000/77.08
execution time (avg/stddev): 66.2880/0.13
## 1
SQL statistics:
queries performed:
read: 0
write: 500000
other: 0
total: 500000
transactions: 500000 (8570.81 per sec.)
queries: 500000 (8570.81 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 58.3354s
total number of events: 500000
Latency (ms):
min: 1.65
avg: 29.86
max: 1059.56
95th percentile: 65.65
sum: 14928212.51
Threads fairness:
events (avg/stddev): 1953.1250/38.22
execution time (avg/stddev): 58.3133/0.01
## 2
SQL statistics:
queries performed:
read: 0
write: 500000
other: 0
total: 500000
transactions: 500000 (8795.15 per sec.)
queries: 500000 (8795.15 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 56.8474s
total number of events: 500000
Latency (ms):
min: 1.54
avg: 29.09
max: 1062.60
95th percentile: 62.19
sum: 14545510.55
Threads fairness:
events (avg/stddev): 1953.1250/33.72
execution time (avg/stddev): 56.8184/0.01
## 3
SQL statistics:
queries performed:
read: 0
write: 500000
other: 0
total: 500000
transactions: 500000 (8601.60 per sec.)
queries: 500000 (8601.60 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 58.1266s
total number of events: 500000
Latency (ms):
min: 1.63
avg: 29.75
max: 1062.72
95th percentile: 65.65
sum: 14875526.89
Threads fairness:
events (avg/stddev): 1953.1250/35.54
execution time (avg/stddev): 58.1075/0.00
内部出现 prepare write error，再压下去，tidb 重试的次数可能会增大。
再提高并发，无法增大吞吐量，因为延迟开始增加。
SQL statistics:
queries performed:
read: 0
write: 500000
other: 0
total: 500000
transactions: 500000 (9499.13 per sec.)
queries: 500000 (9499.13 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 52.6343s
total number of events: 500000
Latency (ms):
min: 1.59
avg: 53.79
max: 1368.40
95th percentile: 118.92
sum: 26894974.62
Threads fairness:
events (avg/stddev): 976.5625/31.13
execution time (avg/stddev): 52.5292/0.01
SQL statistics:
queries performed:
read: 0
write: 500000
other: 0
total: 500000
transactions: 500000 (9418.91 per sec.)
queries: 500000 (9418.91 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 53.0825s
total number of events: 500000
Latency (ms):
min: 1.65
avg: 54.26
max: 1351.11
95th percentile: 118.92
sum: 27130553.14
Threads fairness:
events (avg/stddev): 976.5625/32.76
execution time (avg/stddev): 52.9894/0.02
SQL statistics:
queries performed:
read: 0
write: 500000
other: 0
total: 500000
transactions: 500000 (9752.01 per sec.)
queries: 500000 (9752.01 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 51.2693s
total number of events: 500000
Latency (ms):
min: 1.53
avg: 52.41
max: 1380.21
95th percentile: 116.80
sum: 26206639.03
Threads fairness:
events (avg/stddev): 976.5625/60.60
execution time (avg/stddev): 51.1848/0.03