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• Effect of suffixes in memory operations

  - by tur1ng

  In x86 GNU Assembler there are different suffixes for memory related operations. E.g.: movb, movs, movw, movl, movq, movt(?) Now my question is the following: Does the suffix has ANY effect on how the processor is getting the data out of main memory or will always be one or more 32-bit (x86) chunks loaded into the cache ? What are the effects beside the memory access?

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• Deleting Part of An Array in Java to Free Memory on Heap

  - by kate

  I am implementing a dynamic programming algorithm for the knapsack problem in Java. I declare the array and then initialize its size to be [number of objects][capacity of knapsack]. When my number of objects or my capacity gets too large, I get a memory error because I run out of space on the heap. My questions is: If I delete rows from my double array as I go along, will Java free the memory as I delete? Or does Java reserve that memory space for the size of the array I originally created? If it's the latter, is there a way to manually free the memory in Java? Thanks for your Help!

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• Large number of tables and Hibernate memory consumption

  - by Vedran

  I'm working on a large ERP project which has database model with about 2100 tables. With "only" 500 tables mapped with Hibernate, application deployed on the web server takes about 3GB of working memory. Is there any way to reduce Hibernate's metamodel memory footprint when using that many tables in one persistence unit? Or should I just give up on ORMs and go with plain old JDBC (or even jOOQ)? Right now I'm using Hibernate 4.1.8, Spring 3.1.3, JBoss AS 7.1 and working with MSSQL database. Edit: JavaMelody memory histogram output - with 2000 generated test tables that are a bit smaller in scope from the original db model (hence 'only' 1.3GB of spent memory)

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• Memory allocation patterns in C++

  - by Mahatma

  I am confused about the memory allocation in C++ in terms of the memory areas such as Const data area, Stack, Heap, Freestore, Heap and Global/Static area. I would like to understand the memory allocation pattern in the following snippet. Can anyone help me to understand this. If there any thing more apart from the variable types mentioned in the example to help understand the concept better please alter the example. class FooBar { int n; //Stored in stack? public: int pubVar; //stored in stack? void foo(int param) //param stored in stack { int *pp = new int; //int is allocated on heap. n = param; static int nStat; //Stored in static area of memory int nLoc; //stored in stack? string str = "mystring"; //stored in stack? .. if(CONDITION) { static int nSIf; //stored in static area of memory int loopvar; //stored in stack .. } } } int main(int) { Foobar bar; //bar stored in stack? or a part of it? Foobar *pBar; //pBar is stored in stack pBar = new Foobar(); //the object is created in heap? What part of the object is stored on heap } EDIT: What confuses me is, if pBar = new Foobar(); stores the object on the heap, how come int nLoc; and int pubVar;, that are components of the object stored on stack? Sounds contradictory to me. Shouldn't the lifetime of pubvar and pBar be the same?

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• Access to a process memory

  - by beloc4369

  why do we allocate virtual memory address space within a process to get a read access to its memory?

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• C# accessing memory map file

  - by ooo

  Looking for code samples to access a memory map file in C#

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• How to track the memory usage in C++

  - by akintayo

  Hi I have a C++ program running under linux. Is it possible to track its memory usage from the code? I am allocating new objects and running out of memory, so I want to keep track of how quickly I am using memory. Thanks

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• Handling out of memory errors in iPhone

  - by hgpc

  I would like to handle out of memory errors in iPhone to execute logic with lesser memory requirements in case I run of of memory. In particular, I would like to do something very similar to the followin pseudo-code: UIImage* image; try { image = [UIImage imageNamed:@"high_quality_image.png"]; } catch (OutOfMemoryException e) { image = [UIImage imageNamed:@"low_quality_image.jpg"]; } First I attempt to load a high-quality image, and if I run out of memory while doing it, then I use a lower quality image. Would this be possible?

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• iPhone real memory climbs when interacting with UI

  - by Scott Gress

  I've been using the Activity Monitor to check the memory usage of my iPhone apps. I've noticed that the Real Memory climbs whenever I interact with the UI in any way, even if there's no code being called. For example, I can create a brand new View-Based application and run it, and as I click or drag in the empty window the Real Memory increases even though the app isn't responding in any way. I get that the view controller is doing some stuff in the background to interpret my interactions, but it seems like the memory should go back down after a second or so. Instead, it keeps going up and up and up as long as I keep clicking or dragging. I can wait forever and it never decreases. This is a little disturbing. Am I missing something?

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• Google Chrome && (cache || memory leaks).

  - by Alexey Ogarkov

  Hello All, I have a big problem with Google Chrome and its memory. My app is displaying to user several image charts and reloads them every 10s. In the interval i have code like that var image = new Image(); var src = 'myurl/image'+new Date().getTime(); image.onload = function() { document.getElementById('myimage').src = src; image.onload = image.onabort = image.onerror = null; } image.src = src; So i have no memory leaks in Firefox and IE. Here the response headers for images Server Apache-Coyote/1.1 Vary * Cache-Control no-store (// I try no-cache, must-revalidate and so on here) Content-Type image/png Content-Length 11131 Date Mon, 31 May 2010 14:00:28 GMT Vary * taken from here In about:cache page there is no my cached images. If i enable purge-memory-button for chrome (--purge-memory-button parameter) it`s not help. Images is in PNG24. So i think that the problem is not in cache. May be Google Chrome is not releasing memory for old images. Please help. Any suggestions. Thanks.

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• x86_64 and memory issues

  - by Valery

  Recently I've switched from ubuntu 32bit to 64bit version. And now I experiencing some problems. All application take twice more memory. And some application takes even more. For example sshd on new server: root 6608 0.0 0.0 67972 2912 ? Ss 14:43 0:00 sshd: deploy [priv] deploy 6616 0.0 0.0 67972 1724 ? S 14:43 0:00 sshd: deploy@pts/4 root 20892 0.0 0.0 50916 1160 ? Ss 15:53 0:00 /usr/sbin/sshd root 21170 0.0 0.0 67972 2912 ? Ss 15:56 0:00 sshd: deploy [priv] deploy 21173 0.0 0.0 67972 1728 ? S 15:56 0:00 sshd: deploy@pts/0 root 23802 0.0 0.0 67972 2912 ? Ss 16:08 0:00 sshd: deploy [priv] deploy 23804 0.0 0.0 67972 1724 ? S 16:08 0:00 sshd: deploy@pts/1 root 24570 0.0 0.0 67972 2908 ? Ss 12:45 0:00 sshd: deploy [priv] deploy 24573 0.0 0.0 68112 1804 ? S 12:45 0:00 sshd: deploy@pts/3 deploy 25014 0.0 0.0 5168 852 pts/0 S+ 16:13 0:00 grep ssh the same on the old server: root 4867 0.0 0.0 5312 1028 ? Ss Mar23 0:00 /usr/sbin/sshd root 23753 0.0 0.0 8052 2556 ? Ss 16:15 0:00 sshd: deploy [priv] deploy 23755 0.0 0.0 8052 1524 ? S 16:15 0:00 sshd: deploy@pts/0 deploy 23770 0.0 0.0 3004 748 pts/0 D+ 16:15 0:00 grep ssh The same problems with postfix, nginx and some other application.

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• OC'ing a Sapphire 7950, problems with memory clock

  - by Cliff

  I bought a new rig with sapphire radeon 7950 flex w/ boost. Good scores initially in 3dmark 11, around 7300 stock. Problem is, as soon as i start overclocking, issues arise. the core clock is at 860, but rises to 925 with boost applied in pressured situations. So all the OC tools are showing 925 as base clock for some reason. Ocing the core clock has been no problem though, got up to 1200 pretty stable, but only an incremental increase in 3dmark 11, to 7600 from 7300, which is worrying. The real trouble starts when i start touching the memory clock. As soon as i touch it even by 1 point up to 1251mhz, the performance goes way down. suddenly i score under 5000 graphics in 3dmark11, no matter if its 1251hz or 1500hz. Ive tried adjusting every other parameter, different tools (sapphiretrixx, catalyst, afterburner) all still the same. Tried upping the power, still same. Where is the issue here?

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• Memory modules not running at rated speeds.

  - by Wesley

  Hi all, I'm having some odd memory issues with my build. Here are my specs right now: QDI Superb 4 motherboard Intel Pentium 4 Northwood 2.4GHz (512KB L2, 533MHz FSB) 3x 256MB PC2100 DDR266 RAM 16MB NVIDIA TNT2 Pro AGP Seagate 80GB IDE HDD Generic USB 2.0 PCI Generic Modem PCI Bestec 250W PSU To be even more specific, here are the current brands and models of each module: Kingston KVR266X64C25/256 Samsung PC2100U-25331-Z SMART SM5643285D4N0CHM0H Supposedly, they are all PC2100 266MHz modules with a latency of 2.5. Looking in Speccy, the Kingston module is somehow running at a speed of PC2300 ~284MHz. I've never overclocked RAM at all as I don't know how to. However, when I first started the computer, I had the SMART module in place first and then reset the BIOS settings, including the integrated overclocking options. However, this still doesn't explain why the Kingston module runs at a higher speed than the SMART and Samsung module. Why is it like this? On a side note, where could I find the motherboard manual for the QDI Superb 4? Thanks in advance.

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• Restoring MBR, partition table, and boot sector of memory card without data loss ("USBC")

  - by Synetech

  Abstract I have a FAT32 memory card that when inserted into a computer causes Windows to prompt to format it. The card is definitely not supposed to be blank and has a bunch of files on it. Symptoms Using a hex-editor/disk-viewer, I examined the card and found that several sectors/clusters have been overwritten with something that has a signature of USBC at the start of the sector. Specifically, the master boot record (and partition table) is gone (hence Windows thinking the card is blank and needing to be formatted), as are the boot sectors (they have the USBC signature and a volume label of NO NAME and partition type of FAT32). Fortunately, it looks like both copies of the FAT are almost entirely intact (a few FAT entries at the start of a cluster here and there seem to be overwritten by USBC). The root directory is also nearly intact—I can see the volume label entry and subdirectory listings, but one sector is overwritten. (There are no more instances of USBC after the last one in the FAT2.) Hypothesis These observations seem to indicate some sort of virus that erases a few key filesystem structures, and then overwrites a few extra sectors here and there. Googling it seems to corroborate the idea of a virus, except that others report a file called USBC which does not apply here, and in fact, could not be possible since there is no filesystem to even see files. I cannot find any information about a virus with these symptoms, nor a removal tool. (I can't help but wonder if it is actually due to an autorun virus prevention tool.) Question I can likely fix the FAT corruption since they are mostly contiguous chains and maybe even the lost sector of the root directory, but does anyone know of a convenient way to restore or (re)create the MBR/partition table and boot sectors (without formatting or overwriting the data)?

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• Out of memory errors but not actually out of memory...

  - by commradepolski

  So, myself and my fellow support techs have been fighting with this issue and we still dont know what the problem is. Lets start off with the system specs: Windows XP 32 bit Corporate (SP2 and SP3) Intel D975XBX2 Mobo 4gb of ram Intel Core 2 Quad Q6600 ATI Radeon HD 3600 - 512mb After a few hours of working on the machine, the end user will begin to see the following symptoms: Out of memory messages Title bars and menus dont draw in properly Problems accessing network resources Problems opening up documents such as MSWord and MSPowerpoint and text files Problems opening up explorer windows General instability We have looked at task manager while this issue was occurring, and all indicators, like PF usage, threads, handles, etc. are normal. We have been having trouble pinpointing the root cause of this issue. It is also not situated with one user, it affects 8-10. So far we have tried: Resetting CMOS (Waiting to see results) Replacing video card (didnt help) Windows updates (didnt help) Updating network drivers (didnt help) Switching user from 1gbps to 100mbps network connection (awaiting results) Swapping the affected user's hardware (waiting for results) Increasing desktop heap size (helped for a bit but then the issue became more frequent) Applying the /3 switch to XP (didnt help) Increasing and decreasing and setting PF to system managed state (didnt help) We did have a power outage at the office a couple weeks ago, and all these issues became more frequent. Prior to the power outage it may take a week or so for the users to experience the issues but since the power outage it takes 3-4 hours or less. We havent had reports of the above issues causing BSODs, although that would be easier to diagnose :). Any help is greatly appreciated.

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• Plesk Uninstall Memory issue

  - by user115079

  I am trying to uninstall plesk from my VPS by running following command: yum remove sw-* psa-* plesk-* when i run this command i get following error: Running rpm_check_debug Running Transaction Test memory alloc (4 bytes) returned NULL. First time when i run above command, this mem alloc (4 bytes) was very big number like (67864987). then i googled it, got some clear/ulimit commands. executed them. rebooted my system. stopped all process and executed this command again. but still getting 4 byte issue. dont know how to get rid of it. I also tried ulimit after reboot but no success and Yes. No swap attached. these are stats of my system [root@vps ~]# free -m total used free shared buffers cached Mem: 384 67 316 0 0 0 -/+ buffers/cache: 67 316 Swap: 0 0 0 top - 21:01:07 up 3:12, 1 user, load average: 0.24, 0.08, 0.03 Tasks: 31 total, 2 running, 29 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 393216k total, 69832k used, 323384k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached is there any other alternative to achieve my goal to uninstall plesk? thanks.

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• memory usage setting

  - by user127610

  everybody,the memory usage is too much,what can i do? top - 12:54:37 up 7 days, 4:38, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 18 total, 2 running, 16 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1048800k total, 917424k used, 131376k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2840 1364 1204 S 0.0 0.1 0:02.17 init 1161 root 14 -4 2320 600 420 S 0.0 0.1 0:00.00 udevd 1391 root 18 0 35512 1288 948 S 0.0 0.1 0:03.53 rsyslogd 1409 root 15 0 8432 1164 700 S 0.0 0.1 0:03.87 sshd 1416 root 18 0 3156 868 692 S 0.0 0.1 0:00.00 xinetd 1423 root 18 0 8672 716 292 S 0.0 0.1 0:00.00 saslauthd 1424 root 18 0 8672 488 64 S 0.0 0.0 0:00.00 saslauthd 1431 root 15 0 7020 1168 616 S 0.0 0.1 0:00.99 crond 1450 root 25 0 6236 1444 1228 S 0.0 0.1 0:00.05 sh 3328 mysql 15 0 799m 42m 4892 S 0.0 4.1 0:02.07 mysqld 15479 root 15 0 11304 3332 2688 R 0.0 0.3 0:00.06 sshd 15482 root 15 0 6372 1688 1404 S 0.0 0.2 0:00.00 bash 15497 root 15 0 2536 1044 864 R 0.0 0.1 0:00.00 top 20137 www 15 0 20672 14m 864 S 0.0 1.4 0:00.87 nginx 22351 www 16 0 52324 26m 9244 S 0.0 2.6 0:13.94 php-fpm 24231 www 16 0 51928 25m 9260 S 0.0 2.5 0:13.52 php-fpm 32682 root 15 0 35832 3228 864 S 0.0 0.3 0:02.18 php-fpm 32686 root 18 0 7368 1616 888 S 0.0 0.2 0:00.00 nginx

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• PHP-FPM High Memory Usage

  - by Ruel

  I have a wordpress blog, that uses WP-SuperCache, and normally I get 100 visitors per day. With nginx + php-fpm it's blazing fast, and I have no regrets. One thing i noticed, php-fpm takes a lot of memory: top - 09:20:43 up 5 days, 15:53, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 26 total, 1 running, 25 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1048576k total, 329956k used, 718620k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10226 www-data 15 0 145m 52m 4584 S 0.0 5.1 0:07.55 php-fpm 10223 www-data 16 0 141m 48m 4692 S 0.0 4.8 0:08.70 php-fpm 20277 www-data 15 0 138m 46m 4368 S 0.0 4.5 0:07.55 php-fpm 20259 www-data 15 0 133m 41m 4600 S 0.0 4.0 0:06.68 php-fpm 12201 www-data 15 0 133m 41m 4632 S 0.0 4.0 0:08.31 php-fpm 11586 www-data 15 0 132m 40m 4292 S 0.0 3.9 0:03.27 php-fpm 29822 www-data 15 0 128m 36m 4356 S 0.0 3.6 0:05.26 php-fpm 28427 mysql 15 0 200m 7300 4764 S 0.0 0.7 0:47.89 mysqld 10202 root 18 0 98.3m 4320 1204 S 0.0 0.4 0:03.80 php-fpm 22524 root 18 0 86064 3396 2652 S 0.0 0.3 0:16.74 sshd 9882 www-data 18 0 42052 2572 804 S 0.0 0.2 0:27.52 nginx 9884 www-data 18 0 42052 2560 804 S 0.0 0.2 0:26.26 nginx 9881 www-data 18 0 42064 2524 804 S 0.0 0.2 0:29.24 nginx 9879 www-data 18 0 42032 2480 804 S 0.0 0.2 0:29.58 nginx 23771 root 15 0 12176 1820 1316 S 0.0 0.2 0:00.08 bash 28344 root 22 0 11932 1416 1184 S 0.0 0.1 0:00.00 mysqld_safe 18167 root 16 0 62628 1208 648 S 0.0 0.1 0:00.55 sshd 25941 root 15 0 12612 1192 928 R 0.0 0.1 0:02.21 top 11573 root 15 0 20876 1168 592 S 0.0 0.1 0:00.67 crond 9878 root 18 0 41000 1112 284 S 0.0 0.1 0:00.00 nginx 21736 root 23 0 21648 936 716 S 0.0 0.1 0:00.00 xinetd 11585 root 18 0 46748 816 428 S 0.0 0.1 0:00.00 saslauthd 14125 root 12 -4 12768 768 452 S 0.0 0.1 0:00.00 udevd 1 root 18 0 10352 728 616 S 0.0 0.1 0:17.93 init 24564 root 15 0 5912 680 544 S 0.0 0.1 0:01.90 syslogd 11618 root 18 0 46748 548 160 S 0.0 0.1 0:00.00 saslauthd Here's my php-fpm config: [global] pid = run/php-fpm.pid error_log = log/php-fpm.log log_level = notice [www] listen = 127.0.0.1:9000 user = www-data group = www-data pm = dynamic pm.max_children = 50 pm.start_servers = 3 pm.min_spare_servers = 3 pm.max_spare_servers = 10 pm.max_requests = 500 Sometimes it goes up to 400MB. And I'm planning to add a new website on my VPS. Is this normal?

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• Single TCP-CLOSE_WAIT connection brings down application till restart

  - by broun

  Recently found a behaviour where my application had a connection in TCP Close_wait state till the app was restarted (after about 5 hours). But during this period the SUnreclaim space was also increasing constantly and went down on restart. The application is runnning on a rhel5 os and Im not very familiar with the memory management system. Would appreciate if someone clould tell me what extactly is the Ureclaim space and why it is increasing in sync with the close_wait.

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• Memory usages in Linux drops frequently

  - by FunkyChicken

  I run a CentOS 5.6 (64bit) machine that has Nginx (latest version) running, with php-fpm (latest version). Things run very well, but since about 2 weeks I noticed in my Munin graphs that about every 2 hours the 'cache' usages drops. Before it used be a steady fully graph, that didn't seem to reset every so often. PHP-FPM settings: pm.max_children = 300 daemonize = yes pm = static listen = /tmp/fpm.sock pm.max_requests = 1000 I have checked the php-fpm.log, and about once per 5 seconds a child process is killed, and restarted. But this is all the time, so this does not explain the sudden drops. I only run Nginx, PHP (via fpm), Munin and vsftpd on this machine. No crons run at exactly the time of the drops. My question: What could be causing these drops in cache usage?

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• SUnreclaim size increasing in syc with a TCP-CLOSE_WAIT till application restart

  - by maver1k

  Recently found a behaviour where my application had a connection in TCP Close_wait state till the app was restarted (after about 5 hours). But during this period the SUnreclaim space was also increasing constantly and went down on restart. The application is runnning on a rhel5 os and Im not very familiar with the memory management system. Would appreciate if someone clould tell me what extactly is the Ureclaim space and why it is increasing in sync with the close_wait. Thanks.

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• What's using up my memory?

  - by Mehrdad

  I already know what's causing this -- it's the driver for FancyCache, which I'd installed myself. But as you can see, nothing in the screenshot tells me anything about this. I just happen to know. So the question is, if I didn't know this, how would I figure out what's using up so much of my RAM? (For reference: It's currently 1.7 GiB used, and the "missing" amount -- for FancyCache -- is 512 MiB. Clearly, that extra half-gigabyte not showing up anywhere I can see below.)

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• Motherboard max memory supported

  - by Ashfame

  I have an Intel DG965RY motherboard and its specification says it supports 8GB with 533 or 667Mhz RAM sticks and only 4GB with 800Mhz RAM sticks. I am running a 64bit OS. I earlier had 2 X 1GB sticks (800Mhz), so I bought 2 X 2GB sticks (800Mhz) and I underclocked them in the settings to run at 667Mhz. Shouldn't it support all 6GB RAM now? It would be a bummer if I will specifically need 667Mhz sticks thinking that at the worst they will underclock and then run at 667Mhz. I tried this because I saw someone posted at some forum that he put in 4GB+ of RAM in the same board @ 800Mhz and the system uses it all. In my case (On Ubuntu), it only shows 3.2GB as of now (link to Question) so needed to confirm if this is a hardware limitation.

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• Ubuntu 14.04 says insufficient memory in my /boot memory alocation while updating

  - by Aravind Dollar

  I am new to Linux platform. I just tried installing Ubuntu alongside windows but allocated only 200 mb to the /boot partition which is not recommended. Now Ubuntu software update keep on insists me no enough space. What should I do? Is there any way to increase my /boot partition without removing the total OS? Or should I completely uninstall Ubuntu and put it back? Please anyone suggest me over this issue. I have no idea what to do. And please be elaborate, as I am new to Linux environment.

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• strange memory usage pattern on windows server 2008 on login through remote desktop..

  - by headsling

  I'm running Windows Server 2008 Datacenter Service Pack 2 on a VM Ware instance with 10Gb ram allocated. I'm not running IIS or SQL Server. Under 'normal' conditions, the machine uses ~5.5Gb of memory. However, when I login to the server through remote desktop, the memory usage slowly climbs up to 9.8Gb of memory in use. After several minutes the memory slowly creeps back down to the 5.5Gb mark. I've tried killing all the processes associated with my login, on login, barring the taskmanager without success, and I can't see any process that is growing in memory usage when the memory is increasing. I'm assuming this is some system level cache that is growing / shrinking... but why is it doing this?

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