[Mono-bugs] [Bug 634529] New: Mono runtime always allocates ~3MB of data for shared file info structs

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=634529

https://bugzilla.novell.com/show_bug.cgi?id=634529#c0


           Summary: Mono runtime always allocates ~3MB of data for shared
                    file info structs
    Classification: Mono
           Product: Mono: Runtime
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: io-layer
        AssignedTo: lupus at novell.com
        ReportedBy: mantas at unity3d.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-US)
AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.126 Safari/533.4

The source, where the problem occurs:
http://github.com/mono/mono/blob/master/mono/io-layer/wapi-private.h

175: #define _WAPI_FILESHARE_SIZE 102400
<...>
195: struct _WapiFileShare share_info[_WAPI_FILESHARE_SIZE];

This array (~3.0 MB) gets allocated almost every time on Android and iPhone
platforms when any of  handles are accessed and this code is unnecessary heap
hungry on mobile platforms.

Defining DISABLE_SHARED_HANDLES doesn't solve the case, because even in this
case memory gets allocated in :
gpointer                                                                        
_wapi_shm_attach (_wapi_shm_t type)                                             
{                                                                               
        guint32 size;                                                           

        switch(type) {                                                          
        case WAPI_SHM_DATA:                                                     
                return g_malloc0 (sizeof(struct _WapiHandleSharedLayout));      

        case WAPI_SHM_FILESHARE:                                                
                return g_malloc0 (sizeof(struct _WapiFileShareLayout));         

        default:                                                                
                g_error ("Invalid type in _wapi_shm_attach ()");                
                return NULL;                                                    
        }                                                                       
}    



Reproducible: Always

Steps to Reproduce:
1. Run mono application check native heap size
2. Reduce _WAPI_FILESHARE_SIZE to 1024 (instead of 102400)
3. Recompile mono & run app, native heap size is reduced by ~2.9 MB

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