bash 确定Mac终端中几个系统变量的值
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Determine values of several system variables in the terminal in a Mac
提问by Kevin Burke
I'm on a Mac. In the terminal, how would you figure out each of the following values?
我在 Mac 上。在终端中，您将如何计算出以下每个值？
- Word size (64 bit vs. 32 bit)
- L1/L2 cache size
- Determine how much memory is being used (like
df, but for RAM)
- 字大小（64 位与 32 位）
- L1/L2 缓存大小
- 确定正在使用多少内存（如
df，但用于 RAM）
Thanks! I know you can find these in Activity Monitor, System Profiler etc. but I am trying to boost my knowledge of the terminal, and UNIX.
谢谢！我知道您可以在 Activity Monitor、System Profiler 等中找到这些，但我正在努力提高我对终端和 UNIX 的了解。
回答by geekosaur
System Profiler is a GUI wrapper around /usr/sbin/system_profiler.
System Profiler 是一个围绕/usr/sbin/system_profiler.
mress:10008 Z$ system_profiler -listDataTypes
Available Datatypes:
SPHardwareDataType
SPNetworkDataType
SPSoftwareDataType
SPParallelATADataType
SPAudioDataType
SPBluetoothDataType
SPCardReaderDataType
SPDiagnosticsDataType
SPDiscBurningDataType
SPEthernetDataType
SPFibreChannelDataType
SPFireWireDataType
SPDisplaysDataType
SPHardwareRAIDDataType
SPMemoryDataType
SPPCIDataType
SPParallelSCSIDataType
SPPowerDataType
SPPrintersDataType
SPSASDataType
SPSerialATADataType
SPUSBDataType
SPAirPortDataType
SPFirewallDataType
SPNetworkLocationDataType
SPModemDataType
SPNetworkVolumeDataType
SPWWANDataType
SPApplicationsDataType
SPDeveloperToolsDataType
SPExtensionsDataType
SPFontsDataType
SPFrameworksDataType
SPLogsDataType
SPManagedClientDataType
SPPrefPaneDataType
SPStartupItemDataType
SPSyncServicesDataType
SPUniversalAccessDataType
mress:10009 Z$ system_profiler SPHardwareDataType
Hardware:
Hardware Overview:
Model Name: iMac
Model Identifier: iMac10,1
Processor Name: Intel Core 2 Duo
Processor Speed: 3.33 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 16 GB
Bus Speed: 1.33 GHz
Boot ROM Version: IM101.00CC.B00
SMC Version (system): 1.52f9
Serial Number (system): QP0241DXB9S
Hardware UUID: 01C6B9E9-B0CB-5249-8AC7-069A3E44A188
You can also get some useful information from /usr/sbin/sysctl(try sysctl -a).
您还可以从/usr/sbin/sysctl（尝试sysctl -a）中获取一些有用的信息。
mress:10014 Z$ sudo sysctl -a | grep cache
Password:
hw.cachelinesize = 64
hw.l1icachesize = 32768
hw.l1dcachesize = 32768
hw.l2cachesize = 6291456
kern.flush_cache_on_write: 0
vfs.generic.nfs.client.access_cache_timeout: 60
vfs.generic.nfs.server.reqcache_size: 64
net.inet.ip.rtmaxcache: 128
net.inet6.ip6.rtmaxcache: 128
hw.cacheconfig: 2 1 2 0 0 0 0 0 0 0
hw.cachesize: 17179869184 32768 6291456 0 0 0 0 0 0 0
hw.cachelinesize: 64
hw.l1icachesize: 32768
hw.l1dcachesize: 32768
hw.l2cachesize: 6291456
machdep.cpu.cache.linesize: 64
machdep.cpu.cache.L2_associativity: 8
machdep.cpu.cache.size: 6144
