AW: Multi-Processor Usage an Lubuntu 13.10 (64-bit) on MacBook
Aere at Dvorak-Keyboards.com
Thu Oct 24 22:07:36 UTC 2013
On 10/24/2013 11:57 AM, Nio Wiklund wrote:
> On 2013-10-24 19:30, Aere Greenway wrote:
>> On 10/24/2013 01:20 AM, Leszek Lesner wrote:
>>> Tryout the terminal command
>>> Cat /proc/cpuinfo
>>> If this shows processor 0 and a processor 1 the system recognized two
>>> CPUs and is using them.
>>> The Qsynth through pulseaudio thing is bad as it had (from my
>>> experience till pulseaudio 2.0) a bad latency. Use Alsa here instead
>>> (needs to suspend pulseaudio first) and test again.
>> I browsed (using the file browser) to /proc, and double-clicked the
>> cpuinfo file.
>> It showed "Intel Core Duo 2" (something like that - I'm going from
>> memory), and the number of cores was displayed as 1. Information
>> (options such as pae) was shown only for one CPU.
>> I then tried booting the Ubuntu 13.04 amd64 live CD.
>> When I hold down the Options key while powering up, with Ubuntu, there
>> are two icons having the round CD icon at the right. The first of those
>> two, is labeled "Windows". The second is labeled "EFI Boot".
>> I booted the Ubuntu 13.04 DVD using the first ("Windows") CD icon.
>> It came up, and ran fine, but system-monitor showed only 1 CPU, and the
>> "/proc/cpuinfo" file agreed with that assessment. There were no desktop
>> hangs observed.
>> I shut it down, and (again holding down the "Options" key when it
>> powers-up) this time I selected the "EFI Boot" CD icon at the far right
>> of the list.
>> It immediately showed a text line saying secure boot was not available,
>> and then presented me with a text menu with entries (as I recall):
>> Try Ubuntu
>> Install Ubuntu
>> Check Disk for Defects
>> I chose "Try Ubuntu", and it booted (eventually) directly into Ubuntu
>> Unity desktop. In this case, system-monitor showed two CPU's, and the
>> "/proc/cpuinfo" file also showed two cores (and info/options about each
>> of them).
>> However, after awhile running, the desktop hung, and I could not do
>> anything further but power down (I did wait quite awhile for it to
>> I then tried the Lubuntu 13.10 amd64-mac live DVD, wanting to try the
>> "EFI Boot" option, but only the "Windows" CD icon was available. On
>> booting this CD, only one CPU was available.
>> I also tried selecting rEFIt on power-up, and it showed the Linux
>> penguin icon (for the Linux partition on the hard disk), and also
>> another penguin icon at the far right, which when highlighted, indicated
>> it was on CD (DVD). I selected this (far right) icon, and booted it.
>> When it came up, it had only one CPU (the "/proc/cpuinfo" file indicated
>> that the number of cores was "1"). The system did not hang in the time
>> I was using it.
>> Regarding my use of PulseAudio, I install it so that I can access the
>> Java Sound (Gervill) synthesizer. If I don't load PulseAudio (and
>> pavucontrol), I cannot use that synthesizer. On all Ubuntu variants,
>> the Java Sound synthesizer expects PulseAudio to be used.
>> When I re-configured Qsynth to use JACK, there were no more cut-outs on
>> the sound. But I (as always with Linux on this MacBook) would only
>> produce audible sound with the laptop speakers - plugging in the
>> amplifier cable into the headphone jack effectively shut off all sound.
> Interesting. It seems there are fundamental problems to run an Ubuntu
> based OS on this computer.
> Best regards
Nio, and all:
I tried running an openSUSE 12.3 live-DVD on that machine, but it failed
I tried Ubuntu/Unity 13.10 i386 on it, and it (like Lubuntu) ends up
with only one CPU.
On that last attempt, I looked at the system log.
I noticed (in particular) "NX (executive disable) is active".
Also, in the log, I extracted the following section, which seems
relevant to the multi-processor problem:
Oct 24 21:05:35 ubuntu kernel: [ 0.020314] CPU: Physical Processor ID: 0
Oct 24 21:05:35 ubuntu kernel: [ 0.020316] CPU: Processor Core ID: 0
Oct 24 21:05:35 ubuntu kernel: [ 0.020321] mce: CPU supports 6 MCE banks
Oct 24 21:05:35 ubuntu kernel: [ 0.020332] CPU0: Thermal monitoring
Oct 24 21:05:35 ubuntu kernel: [ 0.020347] Last level iTLB entries:
4KB 128, 2MB 4, 4MB 4
Oct 24 21:05:35 ubuntu kernel: [ 0.020347] Last level dTLB entries:
4KB 256, 2MB 0, 4MB 32
Oct 24 21:05:35 ubuntu kernel: [ 0.020347] tlb_flushall_shift: -1
Oct 24 21:05:35 ubuntu kernel: [ 0.020791] Freeing SMP alternatives
memory: 28K (c1a3e000 - c1a45000)
Oct 24 21:05:35 ubuntu kernel: [ 0.024023] ACPI: Core revision 20130517
Oct 24 21:05:35 ubuntu kernel: [ 0.031484] ACPI: All ACPI Tables
Oct 24 21:05:35 ubuntu kernel: [ 0.031762] ftrace: allocating 27134
entries in 53 pages
Oct 24 21:05:35 ubuntu kernel: [ 0.044112] Enabling APIC mode: Flat.
Using 1 I/O APICs
Oct 24 21:05:35 ubuntu kernel: [ 0.044586] ..TIMER: vector=0x30
apic1=0 pin1=2 apic2=-1 pin2=-1
Oct 24 21:05:35 ubuntu kernel: [ 0.084546] smpboot: CPU0: Intel(R)
Core(TM)2 Duo CPU P7350 @ 2.00GHz (fam: 06, model: 17, stepping: 0a)
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] Performance Events: PEBS
fmt0+, 4-deep LBR, Core2 events, Intel PMU driver.
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... version: 2
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... bit width: 40
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... generic registers: 2
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... value
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... max
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... fixed-purpose events: 3
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] ... event
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] CPU 1 irqstacks,
Oct 24 21:05:35 ubuntu kernel: [ 0.088000] smpboot: Booting Node 0,
Processors #1 OK
Oct 24 21:05:35 ubuntu kernel: [ 5.178391] smpboot: CPU1: Not responding
Oct 24 21:05:35 ubuntu kernel: [ 5.178411] Brought up 1 CPUs
Oct 24 21:05:35 ubuntu kernel: [ 5.178414] smpboot: Total of 1
processors activated (3979.99 BogoMIPS)
Oct 24 21:05:35 ubuntu kernel: [ 5.178532] NMI watchdog: enabled on
all CPUs, permanently consumes one hw-PMU counter.
Oct 24 21:05:35 ubuntu kernel: [ 5.180156] devtmpfs: initialized
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