== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:12:59 (1718399579)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.627796 s, 167 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: 6.54043
Iter 1/10: OSS cache speed: 6.83772
Iter 1/10: ladvise speed: 6.11671
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.62649
Iter 2/10: OSS cache speed: 6.84379
Iter 2/10: ladvise speed: 6.64192
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.46134
Iter 3/10: OSS cache speed: 6.63517
Iter 3/10: ladvise speed: 6.49047
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.17502
Iter 4/10: OSS cache speed: 7.539
Iter 4/10: ladvise speed: 7.6848
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.66289
Iter 5/10: OSS cache speed: 7.66349
Iter 5/10: ladvise speed: 6.79641
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.84241
Iter 6/10: OSS cache speed: 6.16074
Iter 6/10: ladvise speed: 7.62853
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 6.224
Iter 7/10: OSS cache speed: 7.22618
Iter 7/10: ladvise speed: 6.9668
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.37027
Iter 8/10: OSS cache speed: 6.58739
Iter 8/10: ladvise speed: 6.307
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.39384
Iter 9/10: OSS cache speed: 6.34334
Iter 9/10: ladvise speed: 6.24238
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 6.65488
Iter 10/10: OSS cache speed: 6.57308
Iter 10/10: ladvise speed: 6.94084
Average uncached read: 5.89
Average speedup with OSS cached read:  6.84 = +16.12%
Average speedup with ladvise willread:  6.78 = +15.11%
Speedup with OSS cached read less than 20%,  got 6.84%. Skipping ladvise willread check.