使った感想
イメージ容量が結構増える。断片化を極力しないように
まとまった領域を利用しているのかな
Linux-KVM mentions QED, the new QEMU Enhanced Disk format. This new disk format for QEMU/KVM is designed to be much faster than QCOW2 and other existing disk formats available to virtualization users.
2011年から存在してた様子。今2015年なのでもう安定していると見て良いのでは。
使ってみた感じ引っ掛かりがなく早い様子。
QCOW2のパフォーマンスは、qemu-0.14.0以降で大きく改善されている。
- Fedora21 + QCOW2だと体感できる引っ掛かりがある。
- Fedora21 + QEDだと大丈夫っぽい
QEDはKVM専用のフォーマット
qcow3というものも。
ベンチマーク結果らしい
- 個別「[QCOW2][QED]KVM Storage Format Benchmark(IOPS) with fio-2.0.9 on CentOS-6.3」の写真、画像、動画 - yoshi-ken's fotolife
- 拡大画像 - クラウド Watch
UnixBench (Fedora21上)
BYTE UNIX Benchmarks (Version 5.1.3)
System: wwwXX.local: GNU/Linux
OS: GNU/Linux -- 2.6.18-402.el5PAE -- #1 SMP Tue Feb 10 18:29:18 EST 2015
Machine: i686 (i386)
Language: en_US.utf8 (charmap="UTF-8", collate="UTF-8")
CPU 0: QEMU Virtual CPU version 2.1.3 (5600.0 bogomips)
x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
CPU 1: QEMU Virtual CPU version 2.1.3 (5599.7 bogomips)
x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
CPU 2: QEMU Virtual CPU version 2.1.3 (6157.8 bogomips)
x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
CPU 3: QEMU Virtual CPU version 2.1.3 (5944.2 bogomips)
x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
16:05:08 up 8 min, 1 user, load average: 0.00, 0.14, 0.13; runlevel
------------------------------------------------------------------------
Benchmark Run: 火 2月 17 2015 16:05:08 - 16:33:23
4 CPUs in system; running 1 parallel copy of tests
Dhrystone 2 using register variables 19187540.4 lps (10.0 s, 7 samples)
Double-Precision Whetstone 2830.7 MWIPS (10.1 s, 7 samples)
Execl Throughput 3150.0 lps (30.0 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks 486775.1 KBps (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks 122197.1 KBps (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks 1553066.6 KBps (30.0 s, 2 samples)
Pipe Throughput 648617.5 lps (10.0 s, 7 samples)
Pipe-based Context Switching 132098.6 lps (10.0 s, 7 samples)
Process Creation 13702.2 lps (30.0 s, 2 samples)
Shell Scripts (1 concurrent) 7559.2 lpm (60.0 s, 2 samples)
Shell Scripts (8 concurrent) 2190.5 lpm (60.0 s, 2 samples)
System Call Overhead 1392085.2 lps (10.0 s, 7 samples)
System Benchmarks Index Values BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 19187540.4 1644.2
Double-Precision Whetstone 55.0 2830.7 514.7
Execl Throughput 43.0 3150.0 732.6
File Copy 1024 bufsize 2000 maxblocks 3960.0 486775.1 1229.2
File Copy 256 bufsize 500 maxblocks 1655.0 122197.1 738.4
File Copy 4096 bufsize 8000 maxblocks 5800.0 1553066.6 2677.7
Pipe Throughput 12440.0 648617.5 521.4
Pipe-based Context Switching 4000.0 132098.6 330.2
Process Creation 126.0 13702.2 1087.5
Shell Scripts (1 concurrent) 42.4 7559.2 1782.8
Shell Scripts (8 concurrent) 6.0 2190.5 3650.9
System Call Overhead 15000.0 1392085.2 928.1
========
System Benchmarks Index Score 1045.4
------------------------------------------------------------------------
Benchmark Run: 火 2月 17 2015 16:33:23 - 17:01:41
4 CPUs in system; running 4 parallel copies of tests
Dhrystone 2 using register variables 39946752.2 lps (10.0 s, 7 samples)
Double-Precision Whetstone 10119.7 MWIPS (9.9 s, 7 samples)
Execl Throughput 13117.0 lps (30.0 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks 149799.0 KBps (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks 41334.2 KBps (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks 521744.6 KBps (30.0 s, 2 samples)
Pipe Throughput 1914502.7 lps (10.0 s, 7 samples)
Pipe-based Context Switching 748018.3 lps (10.0 s, 7 samples)
Process Creation 40092.2 lps (30.0 s, 2 samples)
Shell Scripts (1 concurrent) 17342.0 lpm (60.0 s, 2 samples)
Shell Scripts (8 concurrent) 2572.6 lpm (60.0 s, 2 samples)
System Call Overhead 3779586.3 lps (10.0 s, 7 samples)
System Benchmarks Index Values BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 39946752.2 3423.0
Double-Precision Whetstone 55.0 10119.7 1839.9
Execl Throughput 43.0 13117.0 3050.5
File Copy 1024 bufsize 2000 maxblocks 3960.0 149799.0 378.3
File Copy 256 bufsize 500 maxblocks 1655.0 41334.2 249.8
File Copy 4096 bufsize 8000 maxblocks 5800.0 521744.6 899.6
Pipe Throughput 12440.0 1914502.7 1539.0
Pipe-based Context Switching 4000.0 748018.3 1870.0
Process Creation 126.0 40092.2 3181.9
Shell Scripts (1 concurrent) 42.4 17342.0 4090.1
Shell Scripts (8 concurrent) 6.0 2572.6 4287.6
System Call Overhead 15000.0 3779586.3 2519.7
========
System Benchmarks Index Score 1717.9