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Showing entries 1 to 7

Displaying posts with tag: malloc (reset)

One last bit of evil….
+2 Vote Up -0Vote Down
posted by Stewart Smith on Wed 17 Mar 2010 08:33 UTC
Tags:
(edit) code, c++, drizzle, stored procedure, malloc, evil, tcc
You can store things for later! drizzle> select libtcc("#include <string.h>\n#include <stdlib.h>\nint foo(char* s) { char *a= malloc(1000); return snprintf(s, 100, \"%p\", a); }") as RESULT; 
+-----------+
| RESULT    |
+-----------+
| 0x199c610 |
+-----------+
1 row in set (0 sec)
drizzle> select libtcc("#include <string.h>\n#include <stdlib.h>\nint foo(char* s) { char *a= 0x199c610; strcpy(a, \"Hello World!\"); strcpy(s,\"done\"); return strlen(s); }") as result; 
+--------+
| result |
+--------+
| done   |
+--------+
1 row in set (0.01 sec)
drizzle> select libtcc("#include <string.h>\n#include <stdlib.h>\nint foo(char* s) { char *a= 0x199c610; strcpy(s, a); return strlen(s); }") as result; 
+--------------+
| result       |
  [Read more...]
MySQL 5.1 Memory Allocator Bake-Off
Employee +0 Vote Up -0Vote Down
posted by Tim Cook on Wed 17 Dec 2008 19:51 UTC
Tags:
(edit) mysql, performance, solaris, OpenSolaris, tcmalloc, hoard, libumem, malloc, mtmalloc

After getting sysbench running properly with a scalable memory allocator (see last post), I can now return to what I was originally testing - what memory allocator is best for the 5.1 server (mysqld).

This stems out of studies I have made of some patches that have been released by Google. You can read about the work Google has been doing here.

I decided I wanted to test a number of configurations based on the MySQL community source, 5.1.28-rc, namely:

  • The baseline - no Google SMP patch, default memory allocator (5.1.28-rc)
  • With Google SMP patch, mem0pool enabled, no custom malloc (pool)
  • With Google SMP patch, mem0pool enabled, linked with mtmalloc (pool-mtmalloc)
  • With Google SMP patch, mem0pool disabled, linked with tcmalloc (TCMalloc)
  • With Google SMP patch,

  [Read more...]
MySQL 5.1 Memory Allocator Bake-Off
Employee +0 Vote Up -0Vote Down
posted by Tim Cook on Wed 17 Dec 2008 11:51 UTC
Tags:
(edit) mysql, performance, solaris, OpenSolaris, tcmalloc, hoard, libumem, malloc, mtmalloc

After getting sysbench running properly with a scalable memory allocator (see last post), I can now return to what I was originally testing - what memory allocator is best for the 5.1 server (mysqld).

This stems out of studies I have made of some patches that have been released by Google. You can read about the work Google has been doing here.

I decided I wanted to test a number of configurations based on the MySQL community source, 5.1.28-rc, namely:

  • The baseline - no Google SMP patch, default memory allocator (5.1.28-rc)
  • With Google SMP patch, mem0pool enabled, no custom malloc (pool)
  • With Google SMP patch, mem0pool enabled, linked with mtmalloc (pool-mtmalloc)
  • With Google SMP patch, mem0pool disabled, linked with tcmalloc (TCMalloc)
  • With Google SMP patch,

  [Read more...]
MySQL 5.1 Memory Allocator Bake-Off
Employee +0 Vote Up -0Vote Down
posted by Tim Cook on Wed 17 Dec 2008 11:51 UTC
Tags:
(edit) mysql, performance, solaris, OpenSolaris, tcmalloc, hoard, libumem, malloc, mtmalloc

After getting sysbench running properly with a scalable memory allocator (see last post), I can now return to what I was originally testing - what memory allocator is best for the 5.1 server (mysqld).

This stems out of studies I have made of some patches that have been released by Google. You can read about the work Google has been doing here.

I decided I wanted to test a number of configurations based on the MySQL community source, 5.1.28-rc, namely:

  • The baseline - no Google SMP patch, default memory allocator (5.1.28-rc)
  • With Google SMP patch, mem0pool enabled, no custom malloc (pool)
  • With Google SMP patch, mem0pool enabled, linked with mtmalloc (pool-mtmalloc)
  • With Google SMP patch, mem0pool disabled, linked with tcmalloc (TCMalloc)
  • With Google SMP patch,

  [Read more...]
Scalability and Stability for SysBench on Solaris
Employee +0 Vote Up -0Vote Down
posted by Tim Cook on Fri 12 Dec 2008 23:20 UTC
Tags:
(edit) mysql, Random, performance, solaris, OpenSolaris, sysbench, malloc

My mind is playing "Suffering Succotash..."

I have been working on MySQL performance for a while now, and the team I am in have discovered that SysBench could do with a couple of tweaks for Solaris.

Sidebar - sysbench is a simple "OLTP" benchmark which can test multiple databases, including MySQL. Find out all about it here , but go to the download page to get the latest version.

To simulate multiple users sending requests to a database, sysbench uses multiple threads. This leads to two issues we have identified with SysBench on Solaris, namely:

  • The implementation of random() is explicitly identified as unsafe in multi-threaded applications on Solaris. My team has found

  [Read more...]
Scalability and Stability for SysBench on Solaris
Employee +0 Vote Up -0Vote Down
posted by Tim Cook on Fri 12 Dec 2008 15:20 UTC
Tags:
(edit) mysql, Random, performance, solaris, OpenSolaris, sysbench, malloc

My mind is playing "Suffering Succotash..."

I have been working on MySQL performance for a while now, and the team I am in have discovered that SysBench could do with a couple of tweaks for Solaris.

Sidebar - sysbench is a simple "OLTP" benchmark which can test multiple databases, including MySQL. Find out all about it here , but go to the download page to get the latest version.

To simulate multiple users sending requests to a database, sysbench uses multiple threads. This leads to two issues we have identified with SysBench on Solaris, namely:

  • The implementation of random() is explicitly identified as unsafe in multi-threaded applications on Solaris. My team has found

  [Read more...]
Scalability and Stability for SysBench on Solaris
Employee +0 Vote Up -0Vote Down
posted by Tim Cook on Fri 12 Dec 2008 15:20 UTC
Tags:
(edit) mysql, Random, performance, solaris, OpenSolaris, sysbench, malloc

My mind is playing "Suffering Succotash..."

I have been working on MySQL performance for a while now, and the team I am in have discovered that SysBench could do with a couple of tweaks for Solaris.

Sidebar - sysbench is a simple "OLTP" benchmark which can test multiple databases, including MySQL. Find out all about it here , but go to the download page to get the latest version.

To simulate multiple users sending requests to a database, sysbench uses multiple threads. This leads to two issues we have identified with SysBench on Solaris, namely:

  • The implementation of random() is explicitly identified as unsafe in multi-threaded applications on Solaris. My team has

  [Read more...]
Showing entries 1 to 7

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