Comparison between 2.4.8-ac4-new-zoned and 2.4.9pre3 VM perf

[Marcelo Tosatti]

Hi, 

I've compared 2.4.8-ac4 performance with 2.4.9pre3 using postmark. I used
this specific benchmark because it allows me to set read/write ratio of IO
transactions.

Note: I've not used stock 2.4.8-ac4. Its a modified version of it which
updates the zoned approach code (btw, I'm going to send those changes to
Alan soon for inclusion).

The tests have shown that the 2.4.9pre is a bit slower than
2.4.8ac4+newzone.

Configuration:
8way machine limited to 512MB RAM
The base number of files is 500
Transactions: 9000
Files are 5.00 megabytes in size
Block sizes are: read=512 bytes, write=512 bytes

2.4.8-ac4-newzoned

bias read 10 (approx 10/1 read/write ratio)

Time:
        2265 seconds total
        2216 seconds of transactions (4 per second)

Files:
        5046 created (2 per second)
                Creation alone: 500 files (10 per second)
                Mixed with transactions: 4546 files (2 per second)
        9000 read (4 per second)
        0 appended (0 per second)
        5046 deleted (2 per second)
                Deletion alone: 592 files (592 per second)
                Mixed with transactions: 4454 files (2 per second)

Data:
        45000.00 megabytes read (19.87 megabytes per second)
        25230.00 megabytes written (11.14 megabytes per second)

bias read 1 (approx 1/10 read/write ratio)

Time:
        649 seconds total
        601 seconds of transactions (14 per second)

Files:
        5046 created (7 per second)
                Creation alone: 500 files (10 per second)
                Mixed with transactions: 4546 files (7 per second)
        876 read (1 per second)
        0 appended (0 per second)
        5046 deleted (7 per second)
                Deletion alone: 592 files (592 per second)
                Mixed with transactions: 4454 files (7 per second)
Data:
        4380.00 megabytes read (6.75 megabytes per second)
        25230.00 megabytes written (38.88 megabytes per second)

2.9.4-pre3

bias read 10

Time:
        2264 seconds total
        2214 seconds of transactions (4 per second)

Files:
        5046 created (2 per second)
                Creation alone: 500 files (10 per second)
                Mixed with transactions: 4546 files (2 per second)
        9000 read (4 per second)
        0 appended (0 per second)
        5046 deleted (2 per second)
                Deletion alone: 592 files (296 per second)
                Mixed with transactions: 4454 files (2 per second)

Data:
        45000.00 megabytes read (19.88 megabytes per second)
        25230.00 megabytes written (11.14 megabytes per second)

bias read 1

Time:
        690 seconds total
        643 seconds of transactions (13 per second)
block
    703 seconds total
        656 seconds of transactions (13 per second)

Files:
        5046 created (7 per second)
                Creation alone: 500 files (10 per second)
                Mixed with transactions: 4546 files (7 per second)
        876 read (1 per second)
        0 appended (0 per second)
        5046 deleted (7 per second)
                Deletion alone: 592 files (592 per second)
                Mixed with transactions: 4454 files (6 per second)

Data:
        4380.00 megabytes read (6.35 megabytes per second)
        25230.00 megabytes written (36.57 megabytes per second)