== sanity test 255a: check 'lfs ladvise -a willread' ===== 02:37:12 (1713508632)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.595026 s, 176 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: 4.30599
Iter 1/10: OSS cache speed: 4.78629
Iter 1/10: ladvise speed: 3.80654
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.93639
Iter 2/10: OSS cache speed: 4.64449
Iter 2/10: ladvise speed: 4.53964
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.16421
Iter 3/10: OSS cache speed: 4.34923
Iter 3/10: ladvise speed: 5.36794
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.34974
Iter 4/10: OSS cache speed: 4.82428
Iter 4/10: ladvise speed: 5.39436
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.8575
Iter 5/10: OSS cache speed: 5.32052
Iter 5/10: ladvise speed: 4.34826
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.33249
Iter 6/10: OSS cache speed: 4.01151
Iter 6/10: ladvise speed: 4.52405
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.25438
Iter 7/10: OSS cache speed: 3.16773
Iter 7/10: ladvise speed: 3.81102
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.42572
Iter 8/10: OSS cache speed: 4.79585
Iter 8/10: ladvise speed: 5.21873
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.16308
Iter 9/10: OSS cache speed: 4.96878
Iter 9/10: ladvise speed: 4.8629
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.20862
Iter 10/10: OSS cache speed: 4.79115
Iter 10/10: ladvise speed: 5.11466
Average uncached read: 4.39
Average speedup with OSS cached read:  4.56 = +3.87%
Average speedup with ladvise willread:  4.69 = +6.83%
Speedup with OSS cached read less than 20%,  got 4.56%. Skipping ladvise willread check.