20140728

1. 영어 기사 읽기
1) To punish Russia, Europe must be prepared to suffer, CNN
– And while Europe’s leaders are acutely aware of the threat to peace on their Eastern flank, the countries with the most at stake have, time after time, seemed unable to present a united and resolute front. (flank – 측면)
– But the downing of Malaysia Airlines Flight 17 has become a game changer — a watershed moment which most concede would be too dangerous to let go. (watershed – 분수령, concede – 인정하다)
– Just as the region is trying its best to revive a stagnant economy, attempting to mend a fragile debt market and tackle high unemployment, alienating a major trading partner next door is a risk Europe’s ministers are understandably loath to take. (revive – 활기를 불어넣다, mend – 고치다, loath – ~하기를 꺼리는)
– For Germany, curtailed trade with Russia could really bite. (curtail – 줄이다, 삭감하다)
– Sectors like the automotive industry, defense and engineering which have haemorrhaged jobs since the 2008 crisis would be hit hard once again. (haemorrhage – 출혈)
– By tightening the noose over Russia’s banks, Europe hopes not only to turn the country’s key industrialists away from president Putin but also to limit the Kremlin’s ability to fund its banks on the international markets, meaning Russia would have to dig deep into its currency reserves and undermine the value of the Ruble — a currency which has up until now been surprisingly unruffled. (noose – 올가미, unruffled – 마음을 가라앉히다, 진정시키다)

2) Second American infected with Ebola, CNN
– A second American aid worker in Liberia has tested positive for Ebola, according to the Christian humanitarian group she works for. (aid worker – 국제 구호원)
– Last week, a Liberian man hospitalized with Ebola in Lagos died, Nigerian Health Minister Onyebuchi Chukwu said. (hospitalize – 입원하다)
– The disease isn’t contagious until symptoms appear. Symptoms include fever, headache and fatigue. (fatigue – 피로)

3) South Korea ferry: Students ‘floated from cabins’, BBC
– The ferry tragedy killed scores of students and left a nation in mourning (scores of – 아주 많은)
– The students had obeyed the crew’s orders to stay put, even as water started coming in as the Sewol listed. (stay put – 그대로 있다.)

4) Wikipedia blocks ‘disruptive’ page edits from US Congress, BBC
– Wikipedia administrators have imposed a ban on page edits from computers at the US House of Representatives, following “persistent disruptive editing”. (disruptive – 지장을 주는)


2. Xen vcpu pinning 시도
cacloud20에서 Xen vcpu pinning을 다시 시도해보았다. 알고 보니 방법이 틀렸었다. Xen에서 vcpu pinning은 hot plugging으로 하는 것이 아니었다. 지금까지 오해하고 있었던 것이다. Dom0에서 보이는 cpu core는 vcpu이므로 hot plugging도 불가능하다. Xen에서 vcpu pinning을 하려면 1) 커널 옵션을 추가해주어야 하고, 2) VM config 파일을 수정해야 한다.

1) 커널 옵션 추가
menu.lst의 menu entry의 옵션을 다음과 같이 준다. (dom0_max_vcpus=1 dom0_vcpus_pin)

title           Xen 4.5, Ubuntu 10.04 LTS, kernel 2.6.32.4
root            (hd0,0)
kernel          /boot/xen.gz dom0_mem=1024M vpmu=1 dom0_max_vcpus=1 dom0_vcpus_pin
module          /boot/vmlinuz-2.6.32.4 root=UUID=bb0c3cc6-6cd0-422f-86b3-845c1f6a6312 ro splash console=tty0
module          /boot/initrd.img-2.6.32.4

2) VM config 파일 수정
VM config 파일에 아래 줄을 추가해, 6번에서 9번 core를 VM에 할당했다.

cpus="6-9"

xl vcpu-list 명령어로 cpu core가 pinning되었음을 확인할 수 있었다.

#xl vcpu-list
Name                           ID         VCPU       CPU State            Time(s) CPU Affinity
Domain-0                        0           0          0   r--              56.3  0
gumdaeng                        1           0          9   -b-              13.3  6-9
gumdaeng                        1           1          7   -b-               5.5  6-9
gumdaeng                        1           2          8   -b-               1.5  6-9
gumdaeng                        1           3          6   -b-               2.3  6-9

References :
[1] Xen Configuration File Options, Xen, http://wiki.xen.org/wiki/Xen_Configuration_File_Options
[2] Tuning Xen for Performance, Xen, http://wiki.xen.org/wiki/Tuning_Xen_for_Performance


3. SPEC 설치 시도
./config/linux-ia64-icc91.cfg 에서 -fast 라는 옵션이 문제가 되므로, 해당 옵션을 제거했다. –fast 옵션을 제거했더니 빌드가 잘 되었다.

$ runspec --config=linux-ia64-icc91.cfg --action=build --tune=base bzip2
 runspec v4662 - Copyright 1999-2006 Standard Performance Evaluation Corporation
 Using 'x86_64-linux' tools
 Reading MANIFEST... 17910 files
 Loading runspec modules...............
 Locating benchmarks...found 31 benchmarks in 12 benchsets.
 Locating output formats: ASCII, config, CSV, flags, HTML, mail, PDF, PostScript, raw, Screen, Submission Check
 …
 Benchmarks selected: 401.bzip2
 Compiling Binaries
   Building 401.bzip2 ref base ia64_linux default: (build_base_ia64_linux.0000)
 Build successes: 401.bzip2(base)
 Build Complete
 The log for this run is in /home/gumdaeng/tmp/SPECCPU_2006/result/CPU2006.400.log
runspec finished at Mon Jul 28 11:19:12 2014; 43 total seconds elapsed

아래 명령어로 bzip2 벤치마크를 실행할 수 있었다.

$runspec --config=linux-ia64-icc91.cfg --size=test --tune=base --noreportable --iterations=1 bzip2

알고 보니, 적당히 비슷해 보이는 config 파일을 선택해서는 제대로 컴파일이 되지 않았다. 빌드 환경이 맞는 config 파일을 선택해야 하고, 경로가 맞지 않는 경우에는 경로를 맞춰주어야 했다. 자세한 내용은 SPEC CPU2006 Installation 참고.

Integer benchmark를 빌드했을 때에는 483.xalancbmk에서 build error가 발생했고, floating point benchmark를 빌드했을 때에는 447.dealII에서 build error가 발생했다. 어떻게 해결할 수 있을지 선배님들께 여쭤봐야겠다.

References :
[1] 김창대, SPEC CPU 2006 alpha binary 생성, http://holypsycho.egloos.com/3084145
[2] The ‘runspec’ Command, SPEC, http://www.spec.org/cpu2006/docs/runspec.html
[3] SPEC CPU2006 Compilation for SimpleScalar/Alpha-OSF, http://www.ece.rochester.edu/~parihar/spec2k6.html


4. 리눅스 커널 스터디 준비

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Posted in 1) Memo
One comment on “20140728
  1. […] 1. 영어 기사 읽기 1) Why a Messy Workspace Undermines Your Persistence, HBR – 2) Greece ‘leaves behind the austerity that ruined it,’ party leader vows after vote, CNN – Greece ‘leaves behind the austerity that ruined it,’ party leader vows after vote (austerity – 금욕적임, 내핍 상태) – The firebrand leader of Greece’s left-wing Syriza party appeared to be bracing for a bigger battle as he declared victory in Sunday’s election. (firebrand – 선동가) – “That is a gamble that people in Greece seem to be prepared to take at this point, simply because the terms of its bailout have been so severe,” Greek journalist Elinda Labropoulou told CNN on Sunday. (bailout – 긴급 구제) – After conceding defeat Sunday, outgoing Prime Minister Antonis Samaras said his conscience was clear. (concede – 인정하다, 2014/07/28) […]

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