== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:59:05 (1771970345)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.752575 s, 139 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: 2.76495
Iter 1/10: OSS cache speed: 2.68102
Iter 1/10: ladvise speed: 2.78635
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.97925
Iter 2/10: OSS cache speed: 3.60282
Iter 2/10: ladvise speed: 3.32974
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.89488
Iter 3/10: OSS cache speed: 2.99727
Iter 3/10: ladvise speed: 3.57633
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.36522
Iter 4/10: OSS cache speed: 3.70078
Iter 4/10: ladvise speed: 3.37175
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.69313
Iter 5/10: OSS cache speed: 3.73526
Iter 5/10: ladvise speed: 3.8787
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.24564
Iter 6/10: OSS cache speed: 4.03789
Iter 6/10: ladvise speed: 3.534
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.83741
Iter 7/10: OSS cache speed: 4.12333
Iter 7/10: ladvise speed: 3.94127
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.65041
Iter 8/10: OSS cache speed: 4.49162
Iter 8/10: ladvise speed: 4.13947
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.71331
Iter 9/10: OSS cache speed: 4.89636
Iter 9/10: ladvise speed: 4.65114
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.61381
Iter 10/10: OSS cache speed: 4.879
Iter 10/10: ladvise speed: 4.81637
Average uncached read: 3.67
Average speedup with OSS cached read:  3.91 = +6.53%
Average speedup with ladvise willread:  3.80 = +3.54%
Speedup with OSS cached read less than 20%,  got 3.91%. Skipping ladvise willread check.