# Help in understanding error messages

**URL:** https://community.gatling.io/t/help-in-understanding-error-messages/5607
**Category:** Gatling (Open-Source)
**Created:** [May 6, 2020, 10:45am UTC](https://community.gatling.io/t/help-in-understanding-error-messages/5607 "2020-05-06T10:45:25Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![jupiter\_sailormoon](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@jupiter\_sailormoon](https://community.gatling.io/u/jupiter_sailormoon)
#### Post date: [May 6, 2020, 10:45am UTC](https://community.gatling.io/t/help-in-understanding-error-messages/5607/1 "2020-05-06T10:45:25Z")

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I am running the following test

> setUp(
> 
> OnePost.inject(rampUsers(noOfUsers) during (60 seconds)).protocols(httpProtocol),  
> postTwo.inject(nothingFor(150 second), rampUsers(noOfUsers) during (60 seconds)).protocols(httpProtocol),  
> OneGet.inject(nothingFor(200 second), rampUsers(noOfUsers) during (60 seconds)).protocols(httpProtocol),  
> getTwo.inject(nothingFor(200 second), rampUsers(noOfUsers) during (60 seconds)).protocols(httpProtocol)  
> )

In the above, I have the errors when I noOfUsers are 35000. I noticed also that the CPU was above 90%. Are the errors from the client or gatling?

 ![gat.err2.PNG](https://europe1.discourse-cdn.com/flex013/uploads/gatling2/original/1X/1cab37f0ac2f893a8b38608c715c822f81e7cb6a.png)

Can anyone help me to understand the following error messages

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<div class="post-metadata">

### Author: ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)
#### Post date: [May 6, 2020, 11:29am UTC](https://community.gatling.io/t/help-in-understanding-error-messages/5607/2 "2020-05-06T11:29:34Z")

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IO errors, most likely because you try to generate load from a machine that can’t handle it. Non beaffy laptop on Windows?

 ![gat.err2.PNG](https://europe1.discourse-cdn.com/flex013/uploads/gatling2/original/1X/1cab37f0ac2f893a8b38608c715c822f81e7cb6a.png)

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<div class="post-metadata">

### Author: ![jupiter\_sailormoon](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@jupiter\_sailormoon](https://community.gatling.io/u/jupiter_sailormoon)
#### Post date: [May 6, 2020, 11:38am UTC](https://community.gatling.io/t/help-in-understanding-error-messages/5607/3 "2020-05-06T11:38:10Z")

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Hi,  
I am on an azure VM with4 vcpus, 16 GiB memory and 8 vcpus, 32 GiB memory to generate the load.

 ![gat.err2.PNG](https://europe1.discourse-cdn.com/flex013/uploads/gatling2/original/1X/1cab37f0ac2f893a8b38608c715c822f81e7cb6a.png)

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<div class="post-metadata">

### Author: ![jupiter\_sailormoon](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@jupiter\_sailormoon](https://community.gatling.io/u/jupiter_sailormoon)
#### Post date: [May 6, 2020, 11:42am UTC](https://community.gatling.io/t/help-in-understanding-error-messages/5607/4 "2020-05-06T11:42:47Z")

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Windows server 2019, VM on azure with 4 vcpus, 16 GiB memory and 8 vcpus, 32 GiB memory

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<div class="post-metadata">

### Author: ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)
#### Post date: [May 6, 2020, 12:29pm UTC](https://community.gatling.io/t/help-in-understanding-error-messages/5607/5 "2020-05-06T12:29:40Z")

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1. Generally speaking, Java is as good on Windows as it is on Linux, in particular NIO
2. I hope you don’t have an anti-virus on this server…
3. We have tuning instructions, but for Linux ([https://gatling.io/docs/current/general/operations/](https://gatling.io/docs/current/general/operations/)). Try finding similar instructions for Windows.
4. Linux machines are also available on Azure, if possible, I really recommend switching to Linux for Gatling.

 ![gat.err2.PNG](https://europe1.discourse-cdn.com/flex013/uploads/gatling2/original/1X/1cab37f0ac2f893a8b38608c715c822f81e7cb6a.png)