== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:08:59 (1747400939)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.600067 s, 175 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: 6.16773
Iter 1/10: OSS cache speed: 6.24824
Iter 1/10: ladvise speed: 6.26517
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.4253
Iter 2/10: OSS cache speed: 6.43164
Iter 2/10: ladvise speed: 6.37808
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.41109
Iter 3/10: OSS cache speed: 6.09357
Iter 3/10: ladvise speed: 6.03231
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.19347
Iter 4/10: OSS cache speed: 6.34373
Iter 4/10: ladvise speed: 6.37534
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.28892
Iter 5/10: OSS cache speed: 6.07164
Iter 5/10: ladvise speed: 6.00389
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 6.01763
Iter 6/10: OSS cache speed: 6.46153
Iter 6/10: ladvise speed: 6.07578
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.25529
Iter 7/10: OSS cache speed: 6.32136
Iter 7/10: ladvise speed: 6.15008
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.16425
Iter 8/10: OSS cache speed: 6.1755
Iter 8/10: ladvise speed: 5.93032
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.27514
Iter 9/10: OSS cache speed: 6.25465
Iter 9/10: ladvise speed: 6.42051
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.38091
Iter 10/10: OSS cache speed: 6.20841
Iter 10/10: ladvise speed: 6.19625
Average uncached read: 5.55
Average speedup with OSS cached read:  6.26 = +12.79%
Average speedup with ladvise willread:  6.18 = +11.35%
Speedup with OSS cached read less than 20%,  got 6.26%. Skipping ladvise willread check.