== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:42:09 (1736264529)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.678929 s, 154 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: 5.72669
Iter 1/10: OSS cache speed: 6.51324
Iter 1/10: ladvise speed: 6.46349
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.7272
Iter 2/10: OSS cache speed: 6.59286
Iter 2/10: ladvise speed: 6.32689
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.67074
Iter 3/10: OSS cache speed: 6.47359
Iter 3/10: ladvise speed: 6.59102
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.56348
Iter 4/10: OSS cache speed: 6.58753
Iter 4/10: ladvise speed: 6.79388
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.29193
Iter 5/10: OSS cache speed: 6.5998
Iter 5/10: ladvise speed: 6.53212
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.6506
Iter 6/10: OSS cache speed: 6.37038
Iter 6/10: ladvise speed: 6.02182
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.67222
Iter 7/10: OSS cache speed: 6.20221
Iter 7/10: ladvise speed: 6.22167
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.70323
Iter 8/10: OSS cache speed: 6.57097
Iter 8/10: ladvise speed: 6.74841
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.78339
Iter 9/10: OSS cache speed: 6.60967
Iter 9/10: ladvise speed: 5.86967
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.9181
Iter 10/10: OSS cache speed: 6.71146
Iter 10/10: ladvise speed: 6.78076
Average uncached read: 5.67
Average speedup with OSS cached read:  6.52 = +14.99%
Average speedup with ladvise willread:  6.43 = +13.40%
Speedup with OSS cached read less than 20%,  got 6.52%. Skipping ladvise willread check.