== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:38:52 (1721223532)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.643662 s, 163 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: 2.51369
Iter 1/10: OSS cache speed: 2.52744
Iter 1/10: ladvise speed: 2.51341
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.47229
Iter 2/10: OSS cache speed: 2.63777
Iter 2/10: ladvise speed: 2.52752
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.47641
Iter 3/10: OSS cache speed: 2.44134
Iter 3/10: ladvise speed: 2.46498
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.45313
Iter 4/10: OSS cache speed: 2.46124
Iter 4/10: ladvise speed: 2.41794
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.48467
Iter 5/10: OSS cache speed: 2.5009
Iter 5/10: ladvise speed: 2.39327
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.40678
Iter 6/10: OSS cache speed: 2.42036
Iter 6/10: ladvise speed: 2.41606
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.43536
Iter 7/10: OSS cache speed: 2.38597
Iter 7/10: ladvise speed: 2.38054
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.41155
Iter 8/10: OSS cache speed: 2.37041
Iter 8/10: ladvise speed: 2.41306
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.43347
Iter 9/10: OSS cache speed: 2.44638
Iter 9/10: ladvise speed: 2.3958
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.38475
Iter 10/10: OSS cache speed: 2.39659
Iter 10/10: ladvise speed: 2.42464
Average uncached read: 2.44
Average speedup with OSS cached read:  2.45 = +.40%
Average speedup with ladvise willread:  2.43 = +-.40%
Speedup with OSS cached read less than 20%,  got 2.45%. Skipping ladvise willread check.