== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:07:33 (1747400853)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.687006 s, 153 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.78507
Iter 1/10: OSS cache speed: 5.24623
Iter 1/10: ladvise speed: 4.16931
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.82898
Iter 2/10: OSS cache speed: 6.25226
Iter 2/10: ladvise speed: 6.90526
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.60435
Iter 3/10: OSS cache speed: 6.68207
Iter 3/10: ladvise speed: 5.02291
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.07066
Iter 4/10: OSS cache speed: 7.32075
Iter 4/10: ladvise speed: 6.42708
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.43912
Iter 5/10: OSS cache speed: 7.67893
Iter 5/10: ladvise speed: 7.45552
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.55392
Iter 6/10: OSS cache speed: 6.55491
Iter 6/10: ladvise speed: 6.37501
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.04364
Iter 7/10: OSS cache speed: 6.99821
Iter 7/10: ladvise speed: 7.41693
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.54035
Iter 8/10: OSS cache speed: 6.99143
Iter 8/10: ladvise speed: 5.45315
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.50467
Iter 9/10: OSS cache speed: 6.23959
Iter 9/10: ladvise speed: 4.26114
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.97991
Iter 10/10: OSS cache speed: 4.34127
Iter 10/10: ladvise speed: 4.08053
Average uncached read: 4.73
Average speedup with OSS cached read:  6.43 = +35.94%
Average speedup with ladvise willread:  5.75 = +21.56%
Speedup with OSS cached read less than 20%,  got 6.43%. Skipping ladvise willread check.