Runtime#availableProcessors()在Linux服务器上未返回正确的结果 [英] Runtime#availableProcessors() doesn't return correct result on Linux server
问题描述
我通常运行 Runtime#availableProcessors
来确定Windows计算机上有多少个内核,并且工作正常。结果与我在控制面板中找到的结果一致。
I usually run Runtime#availableProcessors
to determine how many cores on a Windows computer and it works fine. The result is consistent with that I found from control panel.
但是,当我在Linux服务器上应用API时,它返回 1
。据我所知,服务器功能更强大,对我来说这不是一个单一的CPU系统。
However when I applied the API on a Linux server, it returns 1
. As I know the server is more powerful it doesn't make sense to me it's a single cpu system.
我做了一些搜索,发现Linux机器是 Intel(R)Xeon(R)CPU X5675 @ 3.07GHz
,则谷歌搜索显示它具有 6
个cpu内核。
I did some search and found the Linux box is Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
, googling shows it has 6
cpu cores.
然后,问题是,为什么 Runtime#availableProcessors
误报了吗?
Then the question is, why Runtime#availableProcessors
misreported? Is it a bug?
谢谢
John
这是 / proc / cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
stepping : 2
cpu MHz : 3059.000
cache size : 12288 KB
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc up ida nonstop_tsc arat pni ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm
bogomips : 6118.00
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: [8]
推荐答案
I必须是服务器的配置方式(也许您正在VM中运行)。在我的个人Linux笔记本电脑上运行时,
It must be how your server is configured (perhaps you're running in a VM). When I run, on my personal Linux laptop,
public static void main(String[] args) {
System.out.println(Runtime.getRuntime().availableProcessors());
}
我得到
4
,因为这台机器有四个内核。并且 cat / proc / cpuinfo
报告相同。
as this machine has four cores. And cat /proc/cpuinfo
reports the same.
这篇关于Runtime#availableProcessors()在Linux服务器上未返回正确的结果的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!