Re: Syntax question...

[Howard Chu <hyc@symas.com>]

Armbrust, Daniel C. wrote:

> Howard recommended that I modify back-bdb/idl.h BDB_IDL_DB_SIZE and 
> BDB_IDL_UM_SIZE to work around a problem I reported (ITS #3343).
>
> Those lines of code are:
>
> /* IDL sizes - likely should be even bigger
> *   limiting factors: sizeof(ID), thread stack size
> */
> #define BDB_IDL_DB_SIZE         (1<<16) /* 64K IDL on disk */
> #define BDB_IDL_UM_SIZE         (1<<17) /* 128K IDL in memory */
>
>
> This is probably something I should know - but what numbers would I put in here if I wanted to quadruple each of these variable values?  I don't understand the syntax of (1<<16) (and haven't been able to find any documentation)
>  
You should probably find a C language reference guide if you don't 
understand the syntax.

Also note that each thread allocates a bunch of these IDLs in a private 
stack, so changing these numbers will increase the memory usage of each 
thread by a large amount.

--
 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
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