Yesterday I was going over some scripts and notes from a class and noticed that queries were a lot slower. Queries that took 0 ms of cpu time and 10 ms of elapsed time before were taking over 10 seconds. Task Manager showed that SQL Server Windows NT - 64 Bit was running and using 5 GB out of 8 GB of my memory. I stopped running queries but it went on for hours until dropped down to 2 GB and went on until
I shut it down around 10 pm. This morning SQL Server Windows NT- 64 Bit was using
a few hundred MB of memory until I ran a stored procedure. As you can see in the picture it shot up to over 4 GB of memory and staying at it. I know for sure that this happens a lot but never thought there was a possibility that it was caused by something I ran. If I end the task, I lose the connection. If I restart my computer, it will restart as well, I tested a couple of times. What is really happening and What should I do? Screenshot of Task Manager
Related
I am doing load testing on my application using jmeter and I have a situation where the cpu usage by the applications jvm goes to 99% and it stays there. Application still work, I am able to login and do some activity. But, it’s understandably slower.
Details of environment:
Server: AMD Optrom, 2.20 Ghz, 8 Core, 64bit, 24 GB RAM. Windows Server 2008 R2 Standard
Application server: jboss-4.0.4.GA
JAVA: jdk1.6.0_25, Java HotSpot(TM) 64-Bit Server VM
JVM settings:
-Xms1G -Xmx10G -XX:MaxNewSize=3G -XX:MaxPermSize=12G -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseCompressedOops -Dsun.rmi.dgc.client.gcInterval=1800000 -Dsun.rmi.dgc.server.gcInterval=1800000
Database: MySql 5.6 (in a different machine)
Jmeter: 2.13
My scenario is that, I make 20 users of my application to log into it and perform normal activity that should not be bringing huge load. Some, minutes into the process, JVM of Jboss goes up and it never comes back. CPU usage will remain like that till JVM is killed.
To help better understand, here are few screen shots.
I found few post which had cup # 100%, but nothing there was same as my situation and could not find a solution.
Any suggestion on what’s to be done will be great.
Regards,
Sreekanth.
To understand the root cause of the high CPU utilization, we need to check the CPU data and thread dumps at same time.
Capture 5-6 thread dumps at the time of the issue. Similarly capture CPU consumption thread-by-thread basis.
Generally the root cause of the CPU issue would be problems with threads like BLOCKED threads, long running threads, dead-lock, long running loops etc. That can be resolved by going through the stacks of the threads.
I used to run 5-6 Matlab instances on a server (Win Server 2008) and they allocated about 50-60Mb each. Now, as I plan to run up to 10 instances simultaneously, I upgraded the server RAM from 1 to 2 GB (running on a VPS) on a Win Server 2012 platform. Now after migrating to the new platform, I see that each Matlab instance is allocating more than 100Mb or RAM each, some up to 150Mb, meaning that the whole migration feels useless. Why is this the case? Does Matlab simply allocate whatever is available, or?
Thanks in advance.
I'm using SQL Server 2008 R2. I have a stored procedure that runs bcp via xp_command shell. On my laptop with a copy of the database, a job with 50000 records is almost instant and bcp performance is 71K rows per sec.
I run exactly the same stored procedure on the server and it takes 1h 51 minutes and bcp performance is 7 rows per sec (so 10,000x slower). The query that selects the data runs in under a second on the server BTW. This happened last week and we restarted the SQL Server instance and it ran pretty quick again on server. After about 5 days, the performance got real slow again, but restarting SQL instance didn't help.
My command is:
bcp "exec DBNAME.dbo.SPNAME 224,1 "
queryout "\\Server\path\OUTPUT\11111.txt" -c -t\t -Usa -P"PASSWORD" -SSQLSERVER
If I run activity monitor, I see my stored procedure process and it says RUNNABLE.
The server is on a VM with 4 cores and 28GB RAM.
If I run the same bcp command from a dos shell, I get same.
I'm at a loss where to look now. Anyone got any suggestions?
TIA
Mark
To answer the question of "where to look" and because the task you are trying to complete involves distributed resources (I'm assuming here because you are using UNC paths)... you have to look into differences between the environments, which when comparing execution between Server and laptop... is just about everything.
Storage (and available storage)
CPU (and available cpu)
Network (and available bandwidth)
Memory (and available memory)
SQL Server version/updates
Maintenance schedules (of which the laptop will likely have none)
concurrent activity (of which the laptop will likely have none)
The data you seem to have addressed. You can confirm that the data/database objects are the same? This is a restored database you are working with on the laptop (restored from the server?) or you've manually inspected tables and indexes if not a restore from the server?
If not restored, could the laptop have less data?
To troubleshoot, you'll also need much more than activity monitor. You'll need performance monitor.
This is from some time ago (not sure why things like this dont expire on here, but oh well).
I am hoping some one can help as I'm at a loss.
On my machine I can run a process that retrieves quite a lot of records using Entity Framework 4 and it uses at maximum about 190 000 KB. On a client machine the same process uses about 800 000 KB.
Client machine is Windows 7.
Does anyone at all have any ideas on what I can look for as to why it's using more memory on the Client machine?
I am hosting IIS based web service applications on Windows 2008 64-bit system running on a Quad core 8G machine. Ran into couple of instances when W3WP was running at 7.6G of memory usage. Nothing else was responding on the system including RDP. Right click on the process from the task manager and creating the dumps, froze the system and all its threads for a long time (close to 30minutes). When the freeze up occurred during off hours, we let the dump run for a while (ran close to 1 hour) but still dump didn't complete. In the interest of getting the system up, we had to kill IIS
Tried other tools like procexp, debug diag etc to create full memory dump and all have the same results
So, what tool does the community use to grab dump files quickly? Or without freezing all the threads? I realize latter might be a rhetorical question. But what are the options for generating such a large dump file without locking up the system for a long time?
IMO you shouldn't have to wait until the process memory grows to 8 GB. I am sure with something like 3 - 4 GB you should be able to detect the memory leak.
Procdump has an option based on memory threshold
-m Memory commit threshold in MB at which to create a dump of the process.
I would you this option to dump the memory of the process.
And also SSD would help in writing faster.
WPA a.k.a xperf (http://msdn.microsoft.com/en-us/performance/cc825801.aspx) is a powerfull tool, to diagnose the applications. You will get call stack of the culprit allocation. You dont have to collect the dump and it is no-invasive and does not load much in production systems
Complete step by step information is available here. http://msdn.microsoft.com/en-us/library/ff190906(v=VS.85).aspx.