== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:26:59 (1736983619)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.74742 s, 140 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: 2.72996
Iter 1/10: OSS cache speed: 2.72898
Iter 1/10: ladvise speed: 3.00229
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.24013
Iter 2/10: OSS cache speed: 2.69276
Iter 2/10: ladvise speed: 2.8046
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.96446
Iter 3/10: OSS cache speed: 3.92018
Iter 3/10: ladvise speed: 3.58952
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.76374
Iter 4/10: OSS cache speed: 2.87899
Iter 4/10: ladvise speed: 2.74664
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.51076
Iter 5/10: OSS cache speed: 3.00139
Iter 5/10: ladvise speed: 3.19119
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.71537
Iter 6/10: OSS cache speed: 3.47705
Iter 6/10: ladvise speed: 3.13495
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.16639
Iter 7/10: OSS cache speed: 3.79701
Iter 7/10: ladvise speed: 3.34475
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.16803
Iter 8/10: OSS cache speed: 3.38223
Iter 8/10: ladvise speed: 1.79784
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.91169
Iter 9/10: OSS cache speed: 3.1051
Iter 9/10: ladvise speed: 3.31884
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.1593
Iter 10/10: OSS cache speed: 2.6586
Iter 10/10: ladvise speed: 3.09741
Average uncached read: 2.63
Average speedup with OSS cached read:  3.16 = +20.15%
Average speedup with ladvise willread:  3.00 = +14.06%
Speedup with OSS cached read less than 20%,  got 3.16%. Skipping ladvise willread check.