Re: SQLFreeHandle() takes eons when running debug

On 12/5/14 10:56 AM, Eric Hill wrote:
> Not sure how this could be the PostgreSQL ODBC driver’s fault, but when
> I run a debug build of my application, calls to SQLFreeHandle() to free
> a statement can have for quite a long time (we’re talking a minute or
> two) before proceeding. This is Windows, 64-bit Unicode, version
> 9.03.03 of the PG ODBC driver. The call stack looks like this when paused:
>
> ntdll.dll!RtlCompareMemoryUlong() + 0x10 bytes
>
> ntdll.dll!RtlpFreeHeap() + 0x113f bytes
>
> ntdll.dll!RtlFreeHeap() + 0x1df bytes
>
> ntdll.dll!RtlDebugFreeHeap() + 0x23f bytes
>
> ntdll.dll!RtlpFreeHeap() + 0x7d5b7 bytes
>
> ntdll.dll!RtlFreeHeap() + 0x1df bytes
>
> msvcr100.dll!free() + 0x1c bytes
>
> psqlodbc35w.dll!00007ff97bc7c827()
>
> [Frames below may be incorrect and/or missing, no
> symbols loaded for psqlodbc35w.dll]
>
> psqlodbc35w.dll!00007ff97bc7656b()
>
> psqlodbc35w.dll!00007ff97bc76044()
>
> psqlodbc35w.dll!00007ff97bc761c7()
>
> psqlodbc35w.dll!00007ff97bc88781()
>
> psqlodbc35w.dll!00007ff97bc66bda()
>
> odbc32.dll!FreeStmt() + 0x2c5 bytes
>
> odbc32.dll!SQLFreeHandle() + 0x2a0 bytes
>
> > Jmp.exe!DBContext::freeStmt(void * &
> hstmt=0x000000001f032030) Line 1644 + 0x14 bytes C++
>
> Running a release build, no such delay. We don’t see anything like this
> for SQL Server, Oracle, DB2, Teradata, or MySQL ODBC drivers. Anyone
> run into this before that can suggest a fix or workaround?

Perhaps this might be relevant (setting _NO_DEBUG_HEAP=1 env var to skip
heap validation):
http://stackoverflow.com/a/18753164

Thanks,
Nikhil