Re: [Qemu-devel] [PATCH] configure: Add support for jemalloc

[Alexandre DERUMIER]

>>You can try using or modifying this systemtap script: 
Thanks, I'll check this.


If it can help, I have done a small top of qemu libc vs jemalloc vs tcmalloc



libc-2.19.so
-------------
started
-------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND  
 5294 root      20   0 26.953g 596744  18468 S   1.0  0.2   0:16.81 qemu  

fio running (200kiops)
----------------------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
                                                                                
                                                                              
  5294 root      20   0 30.373g 633300  18552 S  2053  0.2   9:37.03 qemu   


jemalloc
--------
started
--------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
                                                                                
                                                                              
  1789 root      20   0 11.640g 609224  18812 S   1.0  0.2   0:21.03 qemu  

fio running (300kiops)
----------------------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
                                                                                
                                                                              
  1789 root      20   0 12.868g 684924  19144 S  2689  0.3   4:57.96 qemu   




tcmalloc (16MB)
---------------
started
-------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
                                                                                
                                                                              
  1789 root      20   0 11.640g 609224  18812 S   1.0  0.2   0:21.03 qemu  

fio running (65k iops)
-------------------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
                                                                                
                                                                              
  6900 root      20   0 10.925g 643624  18432 S  1125  0.2   4:18.51 qemu    


tcmalloc (256MB)
---------------
started
-------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND   
 10640 root      20   0 10.117g 584524  18236 S   0.7  0.2   0:16.28 qemu

fio running  (200k iops)
-----------------------
   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
                                                                                
                                                                              
 10640 root      20   0 10.983g 685136  18984 S  2566  0.3  12:34.73 qemu  


----- Mail original -----
De: "pbonzini" <address@hidden>
À: "aderumier" <address@hidden>
Cc: "qemu-devel" <address@hidden>
Envoyé: Mardi 23 Juin 2015 10:57:03
Objet: Re: [PATCH] configure: Add support for jemalloc

On 23/06/2015 10:22, Alexandre DERUMIER wrote: 
> > What is the peak memory usage of jemalloc and tcmalloc? 
> 
> I'll try to use an heap profiling to see. 
> Don't known if "perf" can give me the info easily without profiling ? 

You can try using or modifying this systemtap script: 

https://sourceware.org/systemtap/examples/process/proctop.stp 

Paolo