== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:03:22 (1718928202)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.844129 s, 124 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: 2.79485
Iter 1/10: OSS cache speed: 3.2155
Iter 1/10: ladvise speed: 3.64588
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.5545
Iter 2/10: OSS cache speed: 3.16933
Iter 2/10: ladvise speed: 3.61489
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.50554
Iter 3/10: OSS cache speed: 4.53093
Iter 3/10: ladvise speed: 3.75105
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.02598
Iter 4/10: OSS cache speed: 2.69233
Iter 4/10: ladvise speed: 2.71857
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.71242
Iter 5/10: OSS cache speed: 3.25708
Iter 5/10: ladvise speed: 2.96821
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.22072
Iter 6/10: OSS cache speed: 3.34363
Iter 6/10: ladvise speed: 4.59393
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.05553
Iter 7/10: OSS cache speed: 3.63911
Iter 7/10: ladvise speed: 2.63699
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.54403
Iter 8/10: OSS cache speed: 3.31317
Iter 8/10: ladvise speed: 2.53878
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.65556
Iter 9/10: OSS cache speed: 2.54081
Iter 9/10: ladvise speed: 3.10459
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.81608
Iter 10/10: OSS cache speed: 2.86033
Iter 10/10: ladvise speed: 3.30641
Average uncached read: 3.08
Average speedup with OSS cached read:  3.25 = +5.51%
Average speedup with ladvise willread:  3.28 = +6.49%
Speedup with OSS cached read less than 20%,  got 3.25%. Skipping ladvise willread check.