Hi Tim,
Someone else mentioned that dmidecode has the output, but a quick test seems to have found it unreliable since many of my systems were reporting 30000 MHz. I wish! J Thanks, Justin From: Tim Cutts [mailto:t...@sanger.ac.uk] Sent: Wednesday, September 01, 2010 7:17 AM To: Justin Lloyd Cc: Help-cfengine@cfengine.org Subject: Re: Linux CPU speed On 31 Aug 2010, at 10:23 pm, Justin Lloyd wrote: Here's an interesting question for Nova users and/or Linux experts. I have a number of measurements promises that extract information about a system and store that data in our asset database. However, if dynamic CPU throttling is enabled on (mainly RHEL) Linux (e.g. cpuspeed), that value will change and we end up seeing toggling of that value in our asset database (via a report that tracks changes made to it by Cfengine). Currently I'm looking at /proc/cpuinfo: measurements: linux:: "/proc/cpuinfo" handle => "linux_cpu_speed", stream_type => "file", data_type => "int", history_type => "scalar", units => "MHz", match_value => extract_line_value("cpu MHz.*", "cpu MHz\s+:\s+(\d+\.\d+)"); This is the value that changes. One person here suggested looking at the "model name" entry in /proc/cpuinfo, to which newer systems statically add the default CPU speed, but unfortunately we have a lot of systems that don't do that. Parse it out of the output of dmidecode: Processor Information Socket Designation: Proc 1 Type: Central Processor Family: Opteron Manufacturer: AMD ID: 12 0F 04 00 FF FB 8B 17 Signature: Extended Family 0, Model 1, Stepping 2 Flags: FPU (Floating-point unit on-chip) VME (Virtual mode extension) DE (Debugging extension) PSE (Page size extension) TSC (Time stamp counter) MSR (Model specific registers) PAE (Physical address extension) MCE (Machine check exception) CX8 (CMPXCHG8 instruction supported) APIC (On-chip APIC hardware supported) SEP (Fast system call) MTRR (Memory type range registers) PGE (Page global enable) MCA (Machine check architecture) CMOV (Conditional move instruction supported) PAT (Page attribute table) PSE-36 (36-bit page size extension) CLFSH (CLFLUSH instruction supported) MMX (MMX technology supported) FXSR (Fast floating-point save and restore) SSE (Streaming SIMD extensions) SSE2 (Streaming SIMD extensions 2) HTT (Hyper-threading technology) Version: Not Specified Voltage: 1.4 V External Clock: Unknown Max Speed: 2800 MHz Current Speed: 2600 MHz Status: Populated, Enabled Upgrade: ZIF Socket L1 Cache Handle: 0x0710 L2 Cache Handle: 0x0720 L3 Cache Handle: Not Provided Serial Number: Not Specified Asset Tag: Not Specified Part Number: Not Specified Note the Max Speed line - might be what you want, although recent Intel chips seem to lie about it, due to the fact they can switch cores off and increase the clock on the remaining core. Take this from a Nehalem 5504 CPU, for example: Processor Information Socket Designation: Proc 1 Type: Central Processor Family: <OUT OF SPEC> Manufacturer: Intel ID: A5 06 01 00 FF FB EB BF Version: Intel(R) Xeon(R) CPU E5504 @ 2.00GHz Voltage: 1.4 V External Clock: 133 MHz Max Speed: 4800 MHz Current Speed: 2000 MHz Status: Populated, Enabled Upgrade: <OUT OF SPEC> L1 Cache Handle: 0x0710 L2 Cache Handle: 0x0720 L3 Cache Handle: 0x0730 Serial Number: Not Specified Asset Tag: Not Specified Part Number: Not Specified Regards, Tim -- The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE. This electronic communication and any attachments may contain confidential and proprietary information of DigitalGlobe, Inc. If you are not the intended recipient, or an agent or employee responsible for delivering this communication to the intended recipient, or if you have received this communication in error, please do not print, copy, retransmit, disseminate or otherwise use the information. Please indicate to the sender that you have received this communication in error, and delete the copy you received. DigitalGlobe reserves the right to monitor any electronic communication sent or received by its employees, agents or representatives.
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