Possible Memory Leak

Title: Message

Hi,

We've been testing OpenLDAP under fluctuating load over a period of days, and we're consistently seeing growth in the heap.

In general, it's growing in 8k "anonymous" chunks as reported by pmap.

We are running an older version of OpenLDAP 2.1.6, but we did also test against version 2.1.22 and saw the same results.

The slapd process is being run on Solaris 8.

I have attached 2 different memory debuggers to the process, and neither of the debuggers detect a leak.

I used the Sun GC Monitor memory debug tool and Workshop.

Here are some data points from our first test, which ran for about 5 days with fluctuating load:

2004-5-11@15:00:03 [6966] total Kb 20432 14704 9120 5584

2004-5-11@23:50:19 [7201] total Kb 21200 13088 6744 6344

2004-5-12@00:00:18 [7201] total Kb 21200 13096 6744 6352

2004-5-12@23:50:15 [7201] total Kb 21504 13400 6744 6656

2004-5-13@00:00:14 [7201] total Kb 21504 13400 6744 6656

2004-5-13@18:00:10 [7201] total Kb 21696 13600 6752 6848

2004-5-16@08:30:17 [7201] total Kb 22712 14608 6744 7864

2004-5-16@23:50:09 [7201] total Kb 22848 14736 6744 7992

Another test ran for 7 days under a consistent load:

total Kb 17200 16768 14520 2248

total Kb 19056 18704 14488 4216

total Kb 19104 18752 14488 4264

total Kb 19120 18768 14488 4280

total Kb 19160 18808 14488 4320

total Kb 19184 18832 14488 4344

total Kb 19192 18840 14488 4352

total Kb 19200 18848 14488 4360

total Kb 19208 18856 14488 4368

The requests that we are sending to the server are all very similar.

They all retrieve only 1 entry that is approximately the same size for each request.

I had sent another email to the software list a few months ago and received the following message regarding the behaviour:

"This is normal. free() makes the memory available to the application, but not to the OS."

While this may be true, the system should eventually start cleaning up memory. The slapd process is growing continually growing for more than 5 days.

Any ideas on what this may be, how to track it down or explanations on what is causing this would be greatly appreciated.

Sarah