== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:54:45 (1761314085)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 1.63992 s, 63.9 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: 0.957229
Iter 1/10: OSS cache speed: 1.03014
Iter 1/10: ladvise speed: 0.995055
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.954957
Iter 2/10: OSS cache speed: 1.11055
Iter 2/10: ladvise speed: 1.24312
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.948617
Iter 3/10: OSS cache speed: 0.93954
Iter 3/10: ladvise speed: 1.14437
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.989824
Iter 4/10: OSS cache speed: 1.12194
Iter 4/10: ladvise speed: 1.00748
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.803288
Iter 5/10: OSS cache speed: 1.14714
Iter 5/10: ladvise speed: 1.35093
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.89218
Iter 6/10: OSS cache speed: 1.14856
Iter 6/10: ladvise speed: 1.31503
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.03519
Iter 7/10: OSS cache speed: 1.14288
Iter 7/10: ladvise speed: 1.18248
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.794741
Iter 8/10: OSS cache speed: 1.07144
Iter 8/10: ladvise speed: 1.20911
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.887689
Iter 9/10: OSS cache speed: 1.06713
Iter 9/10: ladvise speed: 1.06338
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.916472
Iter 10/10: OSS cache speed: 1.05817
Iter 10/10: ladvise speed: 1.1425
Average uncached read: .91
Average speedup with OSS cached read:  1.08 = +18.68%
Average speedup with ladvise willread:  1.16 = +27.47%
Speedup with OSS cached read less than 20%,  got 1.08%. Skipping ladvise willread check.