How to allocate the same amount of memory in Java?

This is the solution you must eat: it is fixed in Java 1.6.0_23 and above. Runtime.getRuntime (). Exec allocates the same amount of memory for a particular process as for the main process. If you reset the heap size to 1 GB and need to try to run exec, an additional 1 GB will be allocated to run this process. Looks like a bug.

Why is eagain fork cannot allocate enough memory?

EAGAIN fork () cannot allocate enough internal memory to copy the side chairs of the parent and assign the related task structure to the child. EAGAIN A new process could not be created because the caller's RLIMIT_NPROC resource limit was reached.

Linux Java.io.ioexception Error=12 Cannot Allocate Memory

Table of Contents

If you understand that Linux cannot map a memory error code to java.io.ioException error = 12, this tutorial is written to help you.

If you hit error = 12, Unable to allocate memory or error = 12, Not much space, it means your system ran out of memory or swap space when Java tried to fork the process. The problem is how Java allocates memory while processes are running. When Java is executing a process, it may need to fork () to execute exec ().

When someone got error = 12, Unable to allocate memory, or error = 12, Not enough space until it means your system is out of memory or space to swap when Java tried to track down the process. The problem is how Java best allocates memory when executing procedures. When Java is executing a process, it must fork () and then exec ().

Symptoms

When trying to expand a Git-A repository to Fisheye, the following memory-related error often occurs:

Cause

When running Fisheye Git, it can use the fork system call, which can temporarily allocate the same amount to the Git process that would normally be attached to the memory used by the Fisheye JVM. Again, the Git process will never use it, but the system call will definitely fail if the operating system cannot provide it.

Resolution

You can try rebooting Linux from the command line echo 1> / proc / sys / vm / overcommit_memory, but this task may be preferable to free up most of the increased allocated paging space. In general, you should reduce the size of your weapon to what the fish-eye really needs – enlarging will only exacerbate this problem.

  com.atlassian.utils.process.ProcessException: java.io.IOException: program "git" could not be executed (in database "/ home / ubuntu / crucible / var / cache / XXXXX / clone" ): java .io.IOException: error = 12, memory not supportedcom.cenqua.fisheye.rep.RepositoryClientException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Communication error from VCS: sufficient reason for    here at com.atlassian.fisheye.dvcs.DvcsScanner.processRevisions (DvcsScanner.java:298)    at com.atlassian.fisheye.git.GitScanner.processRevisions (GitScanner.java:256)    at com.cenqua.fisheye.rep.BaseRepositoryScanner.slurpRepository (BaseRepositoryScanner.java:258)    at com.cenqua.fisheye.rep.BaseRepositoryScanner.doSlurpTransaction (BaseRepositoryScanner.java:225)    at com.cenqua.fisheye.rep.BaseRepositoryScanner.ping (BaseRepositoryScanner.java:184)    at com.cenqua.fisheye.rep.BaseRepositoryEngine.doSlurp (BaseRepositoryEngine.java:92)    via com.cenqua.fisheye.rep.RepositoryEngine.slurp (RepositoryEngine.java:381)    at com.cenqua.fisheye.rep.ping.OneOffPingRequest.doRequest (OneOffPingRequest.java:28)    at com.cenqua.fisheye.rep.ping.PingRequest.process (PingRequest.java:67)    at com.cenqua.fisheye.rep.RepositoryHandle.processPingRequests (RepositoryHandle.java:138)    Author: com.cenqua.fisheye.rep.RepositoryHandle.queuePingRequest (RepositoryHandle.java:128)    during com.cenqua.fisheye.rep.ping.PingRequest.run (PingRequest.java:33)    via java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1110)    at java.util.concurrent.ThreadPoolExecutor $ Worker.run (ThreadPoolExecutor.java:603)    at java.lang.Thread.run (Thread.java:636)Caused by: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Communication error from VCS: Combined with    at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:214)    at com.atlassian.fisheye.git.GitScanner.processChanges (GitScanner.java:1004)    at com.atlassian.fisheye.git.GitScanner.slurpCommits (GitScanner.java:977)    at com.atlassian.fisheye.dvcs.DvcsScanner.processBranch (DvcsScanner.java:414)    at com.atlassian.fisheye.dvcs.DvcsScanner.processRevisions (DvcsScanner.java:236)    ... eighteen othersCaused by: com.atlassian.utils.process.ProcessException: at runtime: "git whatchanged --always --date-order --reverse -m --no-abbrev --no-renames 22a291b2f78c0e1d69cb1b23b53896d2a4cb174e --pretty = format: C :% H% nP:% P% nA:% aN% nE:% aE% nR:% cN% nF:% cE% nD:% at% nS:% s% nB:% b% n @@ fe_body_end @@ "    at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:262)    only with com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:254)    via com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:212)    ... twenty moreCaused by: com.atlassian.utils.process.ProcessException: com.atlassian.fisheye.dvcs.handler.DvcsProcessRuntimeException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Error despite VCS communication: with    at com.atlassian.utils.process.ExternalProcessImpl $ 4.doTask (ExternalProcessImpl.java:273)    at com.atlassian.utils.process.LatchedRunnable.run (LatchedRunnable.java:25)    ... more 3Caused by: com.atlassian.fisheye.dvcs.handler.DvcsProcessRuntimeException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: VCS communication error: Suffering    at com.atlassian.fisheye.git.GitScanner $ 9.processCommit (GitScanner.java:1083)    at com.atlassian.fisheye.git.client.GitChangeParser.handleCommit (GitChangeParser.java:217)    at com.atlassian.fisheye.git.client.GitChangeParser.scanPaths (GitChangeParser.java:157)    possibly under com.atlassian.fisheye.git.client.GitChangeParser.processLine (GitChangeParser.java:61)    at com.atlassian.utils.process.LineOutputHandler.process (LineOutputHandler.java:49)    with com.atlassian.utils.process.LineOutputHandler.process (LineOutputHandler.java:36)    at com.atlassian.utils.process.PluggableProcessHandler.processOutput (PluggableProcessHandler.java:34)    at com.atlassian.utils.process.ExternalProcessImpl $ 4.doTask (ExternalProcessImpl.java:270)    ... more 4Caused by: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Communication error from VCS: due    at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:214)    at com.atlassian.fisheye.git.GitScanner.getDiffInfo (GitScanner.java:1020)    at com.atlassian.fisheye.git.GitScanner.processGitCommit (GitScanner.java:572)    for com.atlassian.fisheye.git.GitScanner $ 9.processCommit (GitScanner.java: 1081)    ... sixteen moreCaused by: com.atlassian.utils.process.ProcessException: When involved in: "git whatchanged --no-renames --always --no-abbrev --full-index -U0 --pretty = format: 0180dbf3913c63b503973c7c3841c43f2b37b07a"    at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:262)    via com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:254)    by calling com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:212).    ... 17 moreCaused by: com.atlassian.utils.process.ProcessException: java.io.IOException: The "git" program could not be executed (in the "/ home / ubuntu / crucible / var / cache / XXXXX / clone" directory): java. OK IOException: error = 12, memory could not be allocated    at com.atlassian.utils.process.ExternalProcessImpl.start (ExternalProcessImpl.java:241)    with com.atlassian.utils.process.ExternalProcessImpl.execute (ExternalProcessImpl.java:350)    Author: com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand (DvcsContext.java:259)    ... 16.more infoCaused by: java.io.IOException: TV show 'git' could not be executed (in directory '/ home / ubuntu / crucible / var / cache / XXXXX / clone'): java.io.IOException: error = 12, Unable to allocate volume memory    with java.lang.ProcessBuilder.start (ProcessBuilder.java:475)    from java.lang.Runtime.exec (Runtime.java:610)    at com.atlassian.utils.process.ExternalProcessImpl.createProcess (ExternalProcessImpl.java:225)    at com.atlassian.utils.process.ExternalProcessImpl.start (ExternalProcessImpl.java:238)    ... 18 moreReason only: java.io.IOException: java.io.IOException: error = 12, do not resolve memory    in java.lang.UNIXProcess.  (UNIXProcess.java:164)    at java.lang.ProcessImpl.start (ProcessImpl.java:81)    at java.lang.ProcessBuilder.start (ProcessBuilder.java:468)    ... 21 more2012-05-25 07: 29: 52 941 DEBUG [InitialPinger1 XXXXX] fisheye.app - repositorystatus-setengineerror Mechanism error set [XXXXX]: Repository index failed, error occurredcom.cenqua.fisheye.rep.RepositoryClientException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: errorsShared library with VCS:com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Chat error with VCS:com.atlassian.utils.process.While processException: run: "git whatchanged --always --reverse --date-order -m --no-abbrev --no-renames 22a291b2f78c0e1d69cb1b23b53896d2a4cb174e --pretty = format: C:% H % nP:% P% nA:% aN% nE:% aE% nR:% cN% nF:% cE% nD:% at% nS:% s% nB:% b% n @@ fe_body_end @@ "com.atlassian.utils.process.ProcessException: com.atlassian.fisheye.dvcs.handler.DvcsProcessRuntimeException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Communication error with VCS:com.atlassian.fisheye.dvcs.handler.DvcsProcessRuntimeException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: VCS communication error:com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Communication error with VCS:com.atlassian.utils.process.ProcessException: while "git is running: whatchanged - in most cases --no-renames --no-abbrev --full-index -U0 --pretty = format: 0180dbf3913c63b503973c7c3841c43f2b37b07a"com.atlassian.utils.process.ProcessException: java.io.IOException: Unable to start company "git" (in directory "/ home / ubuntu / crucible / var / cache / XXXXX / clone"): java.io .IOException: error = 12, memory cannot be allocatedjava.io.IOException: Could not handle 'git' (in directory '/ home / ubuntu / crucible / var / cache / XXXXX / clone'): java.io.IOException: error = 12, memory could not be allocatedjava.io.IOException: java.io.IOException: error = 12, memory could not be allocated

I am unable to do a simple Java push that starts a process on my system. I do not know howsolve it.

  [root @ newton sisma-acqur] # animal prova.javaimport java.io.IOException;public class provo   public static main (String [] avoid arguments) throw IOException        Runtime.getRuntime (). Exec ("ls");

  [root @ newton sisma-Acquirer] # javac prova.java && java -cp. ! dipException on thread "main" java.io.IOException: program "ls" could not be executed: java.io.IOException: error = 12, Unable to add memory       at java.lang.ProcessBuilder.start (ProcessBuilder.java:474)         java.lang.Runtime.exec (Runtime.java:610)        at java.lang.Runtime.exec (Runtime.java:448)        next to java.lang.Runtime.exec (Runtime.java:345)        to prova.main (prova.java:6)Caused by: java.io.IOException: java.io.IOException: error = 12, memory could not be allocated       when it was java.lang.UNIXProcess.  (UNIXProcess.java:164)        at java.lang.ProcessImpl.start (ProcessImpl.java:81)        with java.lang.ProcessBuilder.start (ProcessBuilder.java:467)        ... ten more

  [root @ newton sisma-Acquirer] # java versionJava version "1.6.0_0"OpenJDK Runtime (IcedTea6 1.5) (fedora-18.b16.fc10-i386)OpenJDK client VM (version 14.0-b15, mixed mode)[root @ newton sisma-acqur] # puma / etc / fedora-releaseFedora version 10 (Cambridge)

EDIT: SolutionThis solves the problem, I don’t quite understand why:

  top - 13:35:38 to 54 mins, 2 users, average freight: 0.43, 0.19, 0.12Home assane: 129 total, fleeing, 1128 having sex, 0 arrested, 3 zombiesCPU: 1.5% us, 0.5% sy, 0.0% ni, 94.8% id, 3.2% wa, 0.0% hi, 0.0% si, 0.0% stMem: 1033456k total, 587672k used, 445784k free, 51672k bufferSwap: 2031608k total, 0k in use, 2031608k free, 188108k cached

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  [root @ newton sisma-acqur] # free             the total number of free shared buffers used in the cacheMemory: 1033456 588548 444908 0 51704 188292- / + buffer / cache: 348552 684904Exchange: 2031608 2031608

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