Re: Thread.sleep CPU time

2017-05-10 Thread Thomas Meyer

> Am 10.05.2017 um 12:02 schrieb Oliver Fernandez 
> :
> 
> But, is it correct Thread to be sleep?

Basically yes. But Brendan Gregg had yesterday an interesting article about CPU 
utilization in modern OSes -  
http://brendangregg.com/blog/2017-05-09/cpu-utilization-is-wrong.html


> 
>> On 10 May 2017 at 10:43, Oliver Fernandez  
>> wrote:
>> So basically we can consider this time as CPU being idle, right?
>> 
>> 
>>> On 10 May 2017 at 10:15, Mark Thomas  wrote:
>>> On 10/05/17 09:02, Oliver Fernandez wrote:
>>> > Sorry about the image. Here's in text format
>>> >
>>> > 
>>> >
>>> >  - org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run() --->
>>> > 42% CPU. This is my webapp code. It's OK
>>> >
>>> >  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
>>> > - AbstractProtocol.java:1138 [Wall Time]
>>> > java.lang.Thread.sleep(long) > 38% CPU
>>> >
>>> >  - 
>>> > org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run()
>>> > - ContainerBase.java:1355 [Wall Time] java.lang.Thread.sleep(long)
>>> > --> 19%
>>> 
>>> You are looking at wall time, not CPU time so those values look fine.
>>> For an explanation of the differences see the YourKit docs:
>>> https://www.yourkit.com/docs/java/help/times.jsp
>>> 
>>> Mark
>>> 
>>> 
>>> >
>>> >
>>> > I'm not sure what this means. is it just that the CPU is IDLE waiting
>>> > for other tasks to complete?
>>> >
>>> >
>>> > On 10 May 2017 at 09:53, Stevo Slavić >> > > wrote:
>>> >
>>> > Maybe sleep call is in a loop - busy waiting, and sleeping too
>>> > short. Sleep
>>> > longer, observe latency after the change. In Java 9 there will be 
>>> > extra
>>> > option
>>> > 
>>> > http://download.java.net/java/jdk9/docs/api/java/lang/Thread.html#onSpinWait--
>>> > 
>>> > 
>>> >
>>> > On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
>>> > oliver.fernan...@marfeel.com >
>>> > wrote:
>>> >
>>> > > While profiling my Tomcat app using YourKit, I noticed two Threads,
>>> > > consuming 57% of total CPU, in the method Thread.sleep()
>>> > >
>>> > > [image: Inline images 1]
>>> > >
>>> > > What's this Thread.sleep() about?
>>> > >
>>> > >
>>> > >
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> >
>>> > *Óliver Fernández*
>>> >
>>> > Principal Architect
>>> >
>>> >
>>> > Inline image 2
>>> >
>>> >
>>> >
>>> >
>>> > Marfeel Solutions S.L.
>>> >
>>> > Rambla Catalunya 35, Principal 2ª
>>> >
>>> > 08007 Barcelona, Spain
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > ES: (+34) 93 178 59 50  ext. 106
>>> >
>>> > US: (+1) 917-341-2540  ext. 106
>>> >
>>> > UK: (+44) 207-048-37-28  ext. 106
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > www.marfeel.com 
>>> >
>>> 
>>> 
>>> -
>>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
>>> For additional commands, e-mail: users-h...@tomcat.apache.org
>>> 
>> 
>> 
>> 
>> -- 
>> Óliver Fernández
>> Principal Architect
>> 
>> 
>> 
>> 
>> Marfeel Solutions S.L.
>> Rambla Catalunya 35, Principal 2ª
>> 08007 Barcelona, Spain
>> 
>> 
>> 
>> ES: (+34) 93 178 59 50 ext. 106
>> US: (+1) 917-341-2540 ext. 106
>> UK: (+44) 207-048-37-28 ext. 106
>> 
>> 
>> www.marfeel.com  
> 
> 
> 
> -- 
> Óliver Fernández
> Principal Architect
> 
> 
> 
> 
> Marfeel Solutions S.L.
> Rambla Catalunya 35, Principal 2ª
> 08007 Barcelona, Spain
> 
> 
> 
> ES: (+34) 93 178 59 50 ext. 106
> US: (+1) 917-341-2540 ext. 106
> UK: (+44) 207-048-37-28 ext. 106
> 
> 
> www.marfeel.com  


Re: Thread.sleep CPU time

2017-05-10 Thread Mark Thomas
On 10/05/17 11:08, Oliver Fernandez wrote:
> Is there anyway to know if this is caused by specific method? For
> example, if a method is waiting for a I/O operation, or network request

Well, you could always look at the source code.

Mark

> 
> On 10 May 2017 at 12:05, Mark Thomas  > wrote:
> 
> On 10/05/17 11:02, Oliver Fernandez wrote:
> > But, is it correct Thread to be sleep?
> 
> Yes.
> 
> > On 10 May 2017 at 10:43, Oliver Fernandez  
> >  >>
> wrote:
> >
> > So basically we can consider this time as CPU being idle, right?
> 
> Yes.
> 
> Mark
> 
> >
> >
> > On 10 May 2017 at 10:15, Mark Thomas  
> > >> wrote:
> >
> > On 10/05/17 09:02, Oliver Fernandez wrote:
> > > Sorry about the image. Here's in text format
> > >
> > > 
> > >
> > >  - 
> org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run() --->
> > > 42% CPU. This is my webapp code. It's OK
> > >
> > >  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
> > > - AbstractProtocol.java:1138 [Wall Time]
> > > java.lang.Thread.sleep(long) > 38% CPU
> > >
> > >  - 
> org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run()
> > > - ContainerBase.java:1355 [Wall Time] 
> java.lang.Thread.sleep(long)
> > > --> 19%
> >
> > You are looking at wall time, not CPU time so those values look
> > fine.
> > For an explanation of the differences see the YourKit docs:
> > https://www.yourkit.com/docs/java/help/times.jsp
> 
> >  >
> >
> > Mark
> >
> >
> > >
> > >
> > > I'm not sure what this means. is it just that the CPU is IDLE 
> waiting
> > > for other tasks to complete?
> > >
> > >
> > > On 10 May 2017 at 09:53, Stevo Slavić  
> >
> > > 
>  > >
> > > Maybe sleep call is in a loop - busy waiting, and 
> sleeping too
> > > short. Sleep
> > > longer, observe latency after the change. In Java 9 there 
> will be extra
> > > option
> > > 
> http://download.java.net/java/jdk9/docs/api/java/lang/Thread.html#onSpinWait--
> 
> 
> > 
>  
> >
> > > 
>  
> 
> > 
>  
> >>
> > >
> > > On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
> > > oliver.fernan...@marfeel.com 
> 
> >  >
> >  
> >   > > wrote:
> > >
> > > > While profiling my Tomcat app using YourKit, I noticed 
> two Threads,
> > > > consuming 57% of total CPU, in the method Thread.sleep()
> > > >
> > > > [image: Inline images 1]
> > > >
> > > > What's this Thread.sleep() about?
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > > --
> > >
> > > *Óliver Fernández*
> > >
> > > Principal Architect
> > >
> > >
> > > Inline image 2
> 

Re: Thread.sleep CPU time

2017-05-10 Thread Oliver Fernandez
Is there anyway to know if this is caused by specific method? For example,
if a method is waiting for a I/O operation, or network request

On 10 May 2017 at 12:05, Mark Thomas  wrote:

> On 10/05/17 11:02, Oliver Fernandez wrote:
> > But, is it correct Thread to be sleep?
>
> Yes.
>
> > On 10 May 2017 at 10:43, Oliver Fernandez  > > wrote:
> >
> > So basically we can consider this time as CPU being idle, right?
>
> Yes.
>
> Mark
>
> >
> >
> > On 10 May 2017 at 10:15, Mark Thomas  > > wrote:
> >
> > On 10/05/17 09:02, Oliver Fernandez wrote:
> > > Sorry about the image. Here's in text format
> > >
> > > 
> > >
> > >  - 
> > org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run()
> --->
> > > 42% CPU. This is my webapp code. It's OK
> > >
> > >  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
> > > - AbstractProtocol.java:1138 [Wall Time]
> > > java.lang.Thread.sleep(long) > 38% CPU
> > >
> > >  - org.apache.catalina.core.ContainerBase$
> ContainerBackgroundProcessor.run()
> > > - ContainerBase.java:1355 [Wall Time]
> java.lang.Thread.sleep(long)
> > > --> 19%
> >
> > You are looking at wall time, not CPU time so those values look
> > fine.
> > For an explanation of the differences see the YourKit docs:
> > https://www.yourkit.com/docs/java/help/times.jsp
> > 
> >
> > Mark
> >
> >
> > >
> > >
> > > I'm not sure what this means. is it just that the CPU is IDLE
> waiting
> > > for other tasks to complete?
> > >
> > >
> > > On 10 May 2017 at 09:53, Stevo Slavić  
> > > >> wrote:
> > >
> > > Maybe sleep call is in a loop - busy waiting, and sleeping
> too
> > > short. Sleep
> > > longer, observe latency after the change. In Java 9 there
> will be extra
> > > option
> > > http://download.java.net/java/jdk9/docs/api/java/lang/
> Thread.html#onSpinWait--
> >  Thread.html#onSpinWait-->
> > >  Thread.html#onSpinWait--
> >  Thread.html#onSpinWait-->>
> > >
> > > On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
> > > oliver.fernan...@marfeel.com
> > 
> >  > >>
> > > wrote:
> > >
> > > > While profiling my Tomcat app using YourKit, I noticed
> two Threads,
> > > > consuming 57% of total CPU, in the method Thread.sleep()
> > > >
> > > > [image: Inline images 1]
> > > >
> > > > What's this Thread.sleep() about?
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > > --
> > >
> > > *Óliver Fernández*
> > >
> > > Principal Architect
> > >
> > >
> > > Inline image 2
> > >
> > >
> > >
> > >
> > > Marfeel Solutions S.L.
> > >
> > > Rambla Catalunya 35, Principal 2ª
> > >
> > > 08007 Barcelona, Spain
> > >
> > >
> > >
> > >
> > >
> > >
> > > ES: (+34) 93 178 59 50 
> >  ext. 106
> > >
> > > US: (+1) 917-341-2540 
> >  ext. 106
> > >
> > > UK: (+44) 207-048-37-28  ext. 106
> > >
> > >
> > >
> > >
> > >
> > > www.marfeel.com  <
> http://www.marfeel.com/>
> > >
> >
> >
> > 
> -
> > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> > 
> > For additional commands, e-mail: users-h...@tomcat.apache.org
> > 
> >
> >
> >
> >
> > --
> >
> > *Óliver Fernández*
> >
> > Principal Architect
> >
> >
> > Inline image 2
> >
> >
> >
> >
> > Marfeel Solutions S.L.
> >
> > Rambla Catalunya 35, Principal 2ª
> >
> > 

Re: Thread.sleep CPU time

2017-05-10 Thread Mark Thomas
On 10/05/17 11:02, Oliver Fernandez wrote:
> But, is it correct Thread to be sleep?

Yes.

> On 10 May 2017 at 10:43, Oliver Fernandez  > wrote:
> 
> So basically we can consider this time as CPU being idle, right?

Yes.

Mark

> 
> 
> On 10 May 2017 at 10:15, Mark Thomas  > wrote:
> 
> On 10/05/17 09:02, Oliver Fernandez wrote:
> > Sorry about the image. Here's in text format
> >
> > 
> >
> >  - org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run() 
> --->
> > 42% CPU. This is my webapp code. It's OK
> >
> >  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
> > - AbstractProtocol.java:1138 [Wall Time]
> > java.lang.Thread.sleep(long) > 38% CPU
> >
> >  - 
> org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run()
> > - ContainerBase.java:1355 [Wall Time] 
> java.lang.Thread.sleep(long)
> > --> 19%
> 
> You are looking at wall time, not CPU time so those values look
> fine.
> For an explanation of the differences see the YourKit docs:
> https://www.yourkit.com/docs/java/help/times.jsp
> 
> 
> Mark
> 
> 
> >
> >
> > I'm not sure what this means. is it just that the CPU is IDLE 
> waiting
> > for other tasks to complete?
> >
> >
> > On 10 May 2017 at 09:53, Stevo Slavić  
> > >> wrote:
> >
> > Maybe sleep call is in a loop - busy waiting, and sleeping too
> > short. Sleep
> > longer, observe latency after the change. In Java 9 there will 
> be extra
> > option
> > 
> http://download.java.net/java/jdk9/docs/api/java/lang/Thread.html#onSpinWait--
> 
> 
> > 
>  
> >
> >
> > On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
> > oliver.fernan...@marfeel.com
> 
>  >>
> > wrote:
> >
> > > While profiling my Tomcat app using YourKit, I noticed two 
> Threads,
> > > consuming 57% of total CPU, in the method Thread.sleep()
> > >
> > > [image: Inline images 1]
> > >
> > > What's this Thread.sleep() about?
> > >
> > >
> > >
> >
> >
> >
> >
> > --
> >
> > *Óliver Fernández*
> >
> > Principal Architect
> >
> >
> > Inline image 2
> >
> >
> >
> >
> > Marfeel Solutions S.L.
> >
> > Rambla Catalunya 35, Principal 2ª
> >
> > 08007 Barcelona, Spain
> >
> >
> >
> >
> >
> >
> > ES: (+34) 93 178 59 50 
>  ext. 106
> >
> > US: (+1) 917-341-2540 
>  ext. 106
> >
> > UK: (+44) 207-048-37-28  ext. 106
> >
> >
> >
> >
> >
> > www.marfeel.com  
> >
> 
> 
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> 
> For additional commands, e-mail: users-h...@tomcat.apache.org
> 
> 
> 
> 
> 
> -- 
> 
> *Óliver Fernández*
> 
> Principal Architect
> 
> 
> Inline image 2
> 
> 
>   
> 
> Marfeel Solutions S.L.
> 
> Rambla Catalunya 35, Principal 2ª
> 
> 08007 Barcelona, Spain
> 
> 
> 
> 
>   
> 
> ES: (+34) 93 178 59 50  ext. 106
> 
> US: (+1) 917-341-2540  ext. 106
> 
> UK: (+44) 207-048-37-28  ext. 106
> 
> 
> 
>   
> 
> www.marfeel.com  
> 
> 
> 
> 
> -- 
> 
> *Óliver Fernández*
> 
> Principal Architect
> 
> 
> Inline image 2
> 
> 
>   
> 
> Marfeel Solutions 

Re: Thread.sleep CPU time

2017-05-10 Thread Oliver Fernandez
But, is it correct Thread to be sleep?

On 10 May 2017 at 10:43, Oliver Fernandez 
wrote:

> So basically we can consider this time as CPU being idle, right?
>
>
> On 10 May 2017 at 10:15, Mark Thomas  wrote:
>
>> On 10/05/17 09:02, Oliver Fernandez wrote:
>> > Sorry about the image. Here's in text format
>> >
>> > 
>> >
>> >  - org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run()
>> --->
>> > 42% CPU. This is my webapp code. It's OK
>> >
>> >  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
>> > - AbstractProtocol.java:1138 [Wall Time]
>> > java.lang.Thread.sleep(long) > 38% CPU
>> >
>> >  - org.apache.catalina.core.ContainerBase$ContainerBackgroundPr
>> ocessor.run()
>> > - ContainerBase.java:1355 [Wall Time] java.lang.Thread.sleep(long)
>> > --> 19%
>>
>> You are looking at wall time, not CPU time so those values look fine.
>> For an explanation of the differences see the YourKit docs:
>> https://www.yourkit.com/docs/java/help/times.jsp
>>
>> Mark
>>
>>
>> >
>> >
>> > I'm not sure what this means. is it just that the CPU is IDLE waiting
>> > for other tasks to complete?
>> >
>> >
>> > On 10 May 2017 at 09:53, Stevo Slavić > > > wrote:
>> >
>> > Maybe sleep call is in a loop - busy waiting, and sleeping too
>> > short. Sleep
>> > longer, observe latency after the change. In Java 9 there will be
>> extra
>> > option
>> > http://download.java.net/java/jdk9/docs/api/java/lang/T
>> hread.html#onSpinWait--
>> > > ad.html#onSpinWait-->
>> >
>> > On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
>> > oliver.fernan...@marfeel.com >
>> > wrote:
>> >
>> > > While profiling my Tomcat app using YourKit, I noticed two
>> Threads,
>> > > consuming 57% of total CPU, in the method Thread.sleep()
>> > >
>> > > [image: Inline images 1]
>> > >
>> > > What's this Thread.sleep() about?
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> >
>> > --
>> >
>> > *Óliver Fernández*
>> >
>> > Principal Architect
>> >
>> >
>> > Inline image 2
>> >
>> >
>> >
>> >
>> > Marfeel Solutions S.L.
>> >
>> > Rambla Catalunya 35, Principal 2ª
>> >
>> > 08007 Barcelona, Spain
>> >
>> >
>> >
>> >
>> >
>> >
>> > ES: (+34) 93 178 59 50  ext. 106
>> >
>> > US: (+1) 917-341-2540  ext. 106
>> >
>> > UK: (+44) 207-048-37-28  ext. 106
>> >
>> >
>> >
>> >
>> >
>> > www.marfeel.com 
>> >
>>
>>
>> -
>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
>> For additional commands, e-mail: users-h...@tomcat.apache.org
>>
>>
>
>
> --
>
> *Óliver Fernández*
>
> Principal Architect
>
> [image: Inline image 2]
>
>
> Marfeel Solutions S.L.
>
> Rambla Catalunya 35, Principal 2ª
>
> 08007 Barcelona, Spain
>
>
>
>
> ES: (+34) 93 178 59 50 ext. 106
>
> US: (+1) 917-341-2540 ext. 106
>
> UK: (+44) 207-048-37-28 <%28%2B44%29%20704-837-28> ext. 106
>
>
> www.marfeel.com
>



-- 

*Óliver Fernández*

Principal Architect

[image: Inline image 2]


Marfeel Solutions S.L.

Rambla Catalunya 35, Principal 2ª

08007 Barcelona, Spain




ES: (+34) 93 178 59 50 ext. 106

US: (+1) 917-341-2540 ext. 106

UK: (+44) 207-048-37-28 <%28%2B44%29%20704-837-28> ext. 106


www.marfeel.com


Re: Thread.sleep CPU time

2017-05-10 Thread Oliver Fernandez
So basically we can consider this time as CPU being idle, right?


On 10 May 2017 at 10:15, Mark Thomas  wrote:

> On 10/05/17 09:02, Oliver Fernandez wrote:
> > Sorry about the image. Here's in text format
> >
> > 
> >
> >  - org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run() --->
> > 42% CPU. This is my webapp code. It's OK
> >
> >  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
> > - AbstractProtocol.java:1138 [Wall Time]
> > java.lang.Thread.sleep(long) > 38% CPU
> >
> >  - org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.
> run()
> > - ContainerBase.java:1355 [Wall Time] java.lang.Thread.sleep(long)
> > --> 19%
>
> You are looking at wall time, not CPU time so those values look fine.
> For an explanation of the differences see the YourKit docs:
> https://www.yourkit.com/docs/java/help/times.jsp
>
> Mark
>
>
> >
> >
> > I'm not sure what this means. is it just that the CPU is IDLE waiting
> > for other tasks to complete?
> >
> >
> > On 10 May 2017 at 09:53, Stevo Slavić  > > wrote:
> >
> > Maybe sleep call is in a loop - busy waiting, and sleeping too
> > short. Sleep
> > longer, observe latency after the change. In Java 9 there will be
> extra
> > option
> > http://download.java.net/java/jdk9/docs/api/java/lang/
> Thread.html#onSpinWait--
> >  Thread.html#onSpinWait-->
> >
> > On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
> > oliver.fernan...@marfeel.com >
> > wrote:
> >
> > > While profiling my Tomcat app using YourKit, I noticed two Threads,
> > > consuming 57% of total CPU, in the method Thread.sleep()
> > >
> > > [image: Inline images 1]
> > >
> > > What's this Thread.sleep() about?
> > >
> > >
> > >
> >
> >
> >
> >
> > --
> >
> > *Óliver Fernández*
> >
> > Principal Architect
> >
> >
> > Inline image 2
> >
> >
> >
> >
> > Marfeel Solutions S.L.
> >
> > Rambla Catalunya 35, Principal 2ª
> >
> > 08007 Barcelona, Spain
> >
> >
> >
> >
> >
> >
> > ES: (+34) 93 178 59 50  ext. 106
> >
> > US: (+1) 917-341-2540  ext. 106
> >
> > UK: (+44) 207-048-37-28  ext. 106
> >
> >
> >
> >
> >
> > www.marfeel.com 
> >
>
>
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>


-- 

*Óliver Fernández*

Principal Architect

[image: Inline image 2]


Marfeel Solutions S.L.

Rambla Catalunya 35, Principal 2ª

08007 Barcelona, Spain




ES: (+34) 93 178 59 50 ext. 106

US: (+1) 917-341-2540 ext. 106

UK: (+44) 207-048-37-28 <%28%2B44%29%20704-837-28> ext. 106


www.marfeel.com


Re: Thread.sleep CPU time

2017-05-10 Thread Mark Thomas
On 10/05/17 09:02, Oliver Fernandez wrote:
> Sorry about the image. Here's in text format
> 
> 
> 
>  - org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run() --->
> 42% CPU. This is my webapp code. It's OK
> 
>  - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
> - AbstractProtocol.java:1138 [Wall Time]
> java.lang.Thread.sleep(long) > 38% CPU
> 
>  - org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run()
> - ContainerBase.java:1355 [Wall Time] java.lang.Thread.sleep(long)
> --> 19%

You are looking at wall time, not CPU time so those values look fine.
For an explanation of the differences see the YourKit docs:
https://www.yourkit.com/docs/java/help/times.jsp

Mark


> 
> 
> I'm not sure what this means. is it just that the CPU is IDLE waiting
> for other tasks to complete?
> 
> 
> On 10 May 2017 at 09:53, Stevo Slavić  > wrote:
> 
> Maybe sleep call is in a loop - busy waiting, and sleeping too
> short. Sleep
> longer, observe latency after the change. In Java 9 there will be extra
> option
> 
> http://download.java.net/java/jdk9/docs/api/java/lang/Thread.html#onSpinWait--
> 
> 
> 
> On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
> oliver.fernan...@marfeel.com >
> wrote:
> 
> > While profiling my Tomcat app using YourKit, I noticed two Threads,
> > consuming 57% of total CPU, in the method Thread.sleep()
> >
> > [image: Inline images 1]
> >
> > What's this Thread.sleep() about?
> >
> >
> >
> 
> 
> 
> 
> -- 
> 
> *Óliver Fernández*
> 
> Principal Architect
> 
> 
> Inline image 2
> 
> 
>   
> 
> Marfeel Solutions S.L.
> 
> Rambla Catalunya 35, Principal 2ª
> 
> 08007 Barcelona, Spain
> 
> 
> 
> 
>   
> 
> ES: (+34) 93 178 59 50  ext. 106
> 
> US: (+1) 917-341-2540  ext. 106
> 
> UK: (+44) 207-048-37-28  ext. 106
> 
> 
> 
>   
> 
> www.marfeel.com  
> 


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Re: Thread.sleep CPU time

2017-05-10 Thread Oliver Fernandez
Sorry about the image. Here's in text format



 - org.apache.tomcat.utils.trheads.TaskThreadWrappingRunnable.run() --->
42% CPU. This is my webapp code. It's OK

 - org.apache.coyote.AbstractProtocol$AsyncTimeout.run()
- AbstractProtocol.java:1138 [Wall Time] java.lang.Thread.sleep(long)
> 38% CPU

 - org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run()
- ContainerBase.java:1355 [Wall Time] java.lang.Thread.sleep(long)
--> 19%


I'm not sure what this means. is it just that the CPU is IDLE waiting for
other tasks to complete?


On 10 May 2017 at 09:53, Stevo Slavić  wrote:

> Maybe sleep call is in a loop - busy waiting, and sleeping too short. Sleep
> longer, observe latency after the change. In Java 9 there will be extra
> option
> http://download.java.net/java/jdk9/docs/api/java/lang/
> Thread.html#onSpinWait--
>
> On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
> oliver.fernan...@marfeel.com> wrote:
>
> > While profiling my Tomcat app using YourKit, I noticed two Threads,
> > consuming 57% of total CPU, in the method Thread.sleep()
> >
> > [image: Inline images 1]
> >
> > What's this Thread.sleep() about?
> >
> >
> >
>



-- 

*Óliver Fernández*

Principal Architect

[image: Inline image 2]


Marfeel Solutions S.L.

Rambla Catalunya 35, Principal 2ª

08007 Barcelona, Spain




ES: (+34) 93 178 59 50 ext. 106

US: (+1) 917-341-2540 ext. 106

UK: (+44) 207-048-37-28 <%28%2B44%29%20704-837-28> ext. 106


www.marfeel.com


Re: Thread.sleep CPU time

2017-05-10 Thread Felix Schumacher


Am 10. Mai 2017 09:44:13 MESZ schrieb Oliver Fernandez 
:
>While profiling my Tomcat app using YourKit, I noticed two Threads,
>consuming 57% of total CPU, in the method Thread.sleep()
>
>[image: Inline images 1]

The image was removed by the mailing list. Could you post the details as text?

Regards,
 Felix

>
>What's this Thread.sleep() about?

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Re: Thread.sleep CPU time

2017-05-10 Thread Stevo Slavić
Maybe sleep call is in a loop - busy waiting, and sleeping too short. Sleep
longer, observe latency after the change. In Java 9 there will be extra
option
http://download.java.net/java/jdk9/docs/api/java/lang/Thread.html#onSpinWait--

On Wed, May 10, 2017 at 9:44 AM, Oliver Fernandez <
oliver.fernan...@marfeel.com> wrote:

> While profiling my Tomcat app using YourKit, I noticed two Threads,
> consuming 57% of total CPU, in the method Thread.sleep()
>
> [image: Inline images 1]
>
> What's this Thread.sleep() about?
>
>
>


Thread.sleep CPU time

2017-05-10 Thread Oliver Fernandez
While profiling my Tomcat app using YourKit, I noticed two Threads,
consuming 57% of total CPU, in the method Thread.sleep()

[image: Inline images 1]

What's this Thread.sleep() about?