1. Introduction to LMbench
Speaker: 陳雋中

2. [猜謎] 雞鴨鵝誰當過兵？
Ans：鴨子
役畢鴨鴨~役畢役畢鴨~

3. What is LMbench? Suite of simple, portable benchmarks
It measures two key features: latency and bandwidth
To transfer data between processor, cache, memory , network and disk
Compares different systems performance
Results available for most major vendors (SUN, HP, IBM, DEC, SGI, PCs

4. What is LMbench? (cont) Bandwidth benchmarks Cached file read
Memory copy (bcopy)
Memory read
Memory write
Pipe
TCP
Latency benchmarks
Context switching.
Networking: connection establishment, pipe, TCP, UDP, and RPC hot potato
File system creates and deletes.
Process creation.
Signal handling
System call overhead
Memory read latency
Miscellaneous
Processor clock rate calculation

5. Memory latency results The memory latency test shows the latency of all of the system (data) caches, i.e., level 1, 2, and 3, if present, as well as main memory and TLB miss latency. In addition the sizes of the caches can be read off of a properly plotted set of results. The hardware folks like this. This benchmark has found bugs in operating system page coloring schemes.
Context switching results Everybody seems to love context switching numbers. This particular benchmark is quite careful not to just quote the ``in cache'' numbers. It varies both the number and size of the procesess and plots the results in such a way that it is easy to see when you don't fit in the cache. You can also see the real costs of a cold cache context switch.

6. Start running
Vary parameters to adjust different workload
DEMO

7. Results(1/3)
Basic system parameters

8. Results(2/3)

9. Results(3/3)

10. Figure(1/2)

11. Figure(2/2)

12. Q:把石頭帶回家犯了什麼罪？？
A:妨礙風化......