# YCSB benchmarking Test

**URL:** <https://forum.yugabyte.com/t/ycsb-benchmarking-test/1323>\
**Category:** General\
**Created:** [November 23, 2021, 7:29pm UTC](https://forum.yugabyte.com/t/ycsb-benchmarking-test/1323 "2021-11-23T19:29:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![surajrrao](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.yugabyte.com/surajrrao/32/419_2.png) [@surajrrao](https://forum.yugabyte.com/u/surajrrao)\
**Post date:** [November 23, 2021, 7:29pm UTC](https://forum.yugabyte.com/t/ycsb-benchmarking-test/1323/1 "2021-11-23T19:29:51Z")

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![image](https://canada1.discourse-cdn.com/flex027/uploads/yugabyte/original/1X/2efc271e5964944fe318bbea1a049dd3a0304e53.png)

We did a YCSB benchmarking test and we found 99th percentile of update/write transaction is bad compared to 95th. Please find the results attached. Any idea why it would have performed this bad?

We have 3 node cluster each with 32g ram, 16 core CPU & SSD disk.

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**Author:** ![Hemant\_Bhanawat](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.yugabyte.com/hemant_bhanawat/32/306_2.png) [@Hemant\_Bhanawat](https://forum.yugabyte.com/u/Hemant_Bhanawat)\
**Post date:** [November 24, 2021, 5:53am UTC](https://forum.yugabyte.com/t/ycsb-benchmarking-test/1323/2 "2021-11-24T05:53:03Z")

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You can follow the discussion here.

> [@Write latency is bad for Yugabyte YCSB Benchmark](https://forum.yugabyte.com/t/write-latency-is-bad-for-yugabyte-ycsb-benchmark/1311/6):
>
> @Huiqing note that you need to show some graphs of the cpus of all the servers at the same time the benchmark is running to easily see if any one of them is overrun.