== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:39:16 (1736264356)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.562882 s, 186 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: 5.55543
Iter 1/10: OSS cache speed: 6.73245
Iter 1/10: ladvise speed: 5.24282
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.75085
Iter 2/10: OSS cache speed: 6.66
Iter 2/10: ladvise speed: 6.6976
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.87192
Iter 3/10: OSS cache speed: 6.76145
Iter 3/10: ladvise speed: 6.66263
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.70368
Iter 4/10: OSS cache speed: 6.20895
Iter 4/10: ladvise speed: 6.36127
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.36288
Iter 5/10: OSS cache speed: 6.49505
Iter 5/10: ladvise speed: 6.15702
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.89878
Iter 6/10: OSS cache speed: 5.67087
Iter 6/10: ladvise speed: 6.64197
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.55312
Iter 7/10: OSS cache speed: 5.53307
Iter 7/10: ladvise speed: 5.35036
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.70638
Iter 8/10: OSS cache speed: 6.63438
Iter 8/10: ladvise speed: 6.5746
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.19773
Iter 9/10: OSS cache speed: 6.70961
Iter 9/10: ladvise speed: 6.66479
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.84192
Iter 10/10: OSS cache speed: 6.77322
Iter 10/10: ladvise speed: 6.57109
Average uncached read: 5.54
Average speedup with OSS cached read:  6.41 = +15.70%
Average speedup with ladvise willread:  6.29 = +13.53%
Speedup with OSS cached read less than 20%,  got 6.41%. Skipping ladvise willread check.