== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:09:30 (1747400970)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.530857 s, 198 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: 4.7858
Iter 1/10: OSS cache speed: 5.13937
Iter 1/10: ladvise speed: 4.17085
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.53263
Iter 2/10: OSS cache speed: 4.59077
Iter 2/10: ladvise speed: 4.07653
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.45263
Iter 3/10: OSS cache speed: 5.16452
Iter 3/10: ladvise speed: 4.8641
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.54282
Iter 4/10: OSS cache speed: 4.8955
Iter 4/10: ladvise speed: 4.9187
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.8898
Iter 5/10: OSS cache speed: 4.87129
Iter 5/10: ladvise speed: 4.82547
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.74101
Iter 6/10: OSS cache speed: 4.39239
Iter 6/10: ladvise speed: 4.72002
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.73522
Iter 7/10: OSS cache speed: 4.90767
Iter 7/10: ladvise speed: 4.96638
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.09075
Iter 8/10: OSS cache speed: 4.75788
Iter 8/10: ladvise speed: 5.16669
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.97385
Iter 9/10: OSS cache speed: 4.72002
Iter 9/10: ladvise speed: 5.11557
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.24479
Iter 10/10: OSS cache speed: 4.91163
Iter 10/10: ladvise speed: 5.02777
Average uncached read: 4.79
Average speedup with OSS cached read:  4.83 = +.83%
Average speedup with ladvise willread:  4.78 = +-.20%
Speedup with OSS cached read less than 20%,  got 4.83%. Skipping ladvise willread check.