== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:29:31 (1748982571)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.583952 s, 180 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: 4.97535
Iter 1/10: OSS cache speed: 6.56577
Iter 1/10: ladvise speed: 6.38748
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.50898
Iter 2/10: OSS cache speed: 4.04197
Iter 2/10: ladvise speed: 4.03119
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.35174
Iter 3/10: OSS cache speed: 5.98063
Iter 3/10: ladvise speed: 5.69021
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.30625
Iter 4/10: OSS cache speed: 5.1321
Iter 4/10: ladvise speed: 4.59361
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.21452
Iter 5/10: OSS cache speed: 5.8272
Iter 5/10: ladvise speed: 5.9445
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.56117
Iter 6/10: OSS cache speed: 3.50061
Iter 6/10: ladvise speed: 4.05639
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.85833
Iter 7/10: OSS cache speed: 4.07901
Iter 7/10: ladvise speed: 3.46414
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.98139
Iter 8/10: OSS cache speed: 3.61399
Iter 8/10: ladvise speed: 3.34875
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.97454
Iter 9/10: OSS cache speed: 3.23882
Iter 9/10: ladvise speed: 3.54061
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.88798
Iter 10/10: OSS cache speed: 3.79051
Iter 10/10: ladvise speed: 4.16812
Average uncached read: 4.06
Average speedup with OSS cached read:  4.57 = +12.56%
Average speedup with ladvise willread:  4.52 = +11.33%
Speedup with OSS cached read less than 20%,  got 4.57%. Skipping ladvise willread check.