== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:52:29 (1736358749)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.667254 s, 157 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: 6.57418
Iter 1/10: OSS cache speed: 6.59421
Iter 1/10: ladvise speed: 6.53467
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.62813
Iter 2/10: OSS cache speed: 6.61969
Iter 2/10: ladvise speed: 5.68125
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.52482
Iter 3/10: OSS cache speed: 6.75721
Iter 3/10: ladvise speed: 6.60153
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.80645
Iter 4/10: OSS cache speed: 6.66059
Iter 4/10: ladvise speed: 6.78434
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.86849
Iter 5/10: OSS cache speed: 7.01715
Iter 5/10: ladvise speed: 6.75167
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.89564
Iter 6/10: OSS cache speed: 6.86632
Iter 6/10: ladvise speed: 6.91205
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.68125
Iter 7/10: OSS cache speed: 7.00267
Iter 7/10: ladvise speed: 7.01126
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 6.06372
Iter 8/10: OSS cache speed: 6.91396
Iter 8/10: ladvise speed: 6.14437
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 6.02673
Iter 9/10: OSS cache speed: 6.969
Iter 9/10: ladvise speed: 7.07837
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.78857
Iter 10/10: OSS cache speed: 6.0995
Iter 10/10: ladvise speed: 6.99956
Average uncached read: 5.88
Average speedup with OSS cached read:  6.75 = +14.79%
Average speedup with ladvise willread:  6.64 = +12.92%
Speedup with OSS cached read less than 20%,  got 6.75%. Skipping ladvise willread check.