如何在 2 核 MacBook Pro 上运行多核？
所以这段代码：
library(plyr)
library(doMC)
registerDoMC(cores=2)
x=1:100
llply(x, some_function, .parallel=TRUE)
失败并出现如下错误：
__THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__ ()
当我从终端运行 R 时，错误消失。所以是 GUI 的一些东西破坏了它。不幸的是，我与协作者共享此代码，因此我无法要求他们从终端运行它。此论坛帖子说< em>看来 doMC 后端的这个问题是由于我一直在采购“/Applications/R.app/Contents/Resources/GUI-tools.R”但我不是故意这样做的在R.app。有什么办法可以消除这种相互冲突的行为吗？
我的 Mac 规格：还运行 R GUI 2.13.1。 OSX 10.7.1，doMC 版本 1.2.3，带 64 位 R.app。还有配备 Intel Core 2 Duo 的 MB Pro 2.53
So this bit of code:
library(plyr)
library(doMC)
registerDoMC(cores=2)
x=1:100
llply(x, some_function, .parallel=TRUE)
fails with an error like so:
__THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__ ()
the error disappears when I run R from terminal. So it's something about the GUI that breaks it. Unfortunately, I share this code with collaborators and so I can't ask them to run it from the terminal. This forum post says It looks as if this problem w/ the doMC backend was coming from my having been sourcing the "/Applications/R.app/Contents/Resources/GUI- tools.R" but I am not intentionally doing that in R.app. Is there any way to turn off this conflicting behavior?
My Mac specs: Also running R GUI 2.13.1. OSX 10.7.1, doMC Version 1.2.3 with 64bit R.app. Also have a MB Pro 2.53 with Intel Core 2 Duo
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如果您想要真正的答案，请在 R-SIG-Mac 上询问;)。这与 GUI 工具无关，它与子进程中运行的 Cocoa 事件循环有关 - 有关 GUI 的警告，请参阅 ?multicore。您可能想要更新到更新的多核，这会禁用 GUI 中的事件循环（如果可能）。还要避免在您运行的代码中进行任何 Quartz 图形调用。
Ask on R-SIG-Mac if you want real answers ;). This has nothing to do with the GUI tools, it has to do with the Cocoa running event loop in the children - see ?multicore for the warning about GUIs. You may want to update to more recent multicore which disables the event loop in the GUI (if possible). Also avoid any Quartz graphics calls in the code you run.