== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:09:45 (1747400985)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.540103 s, 194 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: 4.29376
Iter 1/10: OSS cache speed: 4.25744
Iter 1/10: ladvise speed: 4.73084
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.29198
Iter 2/10: OSS cache speed: 3.94508
Iter 2/10: ladvise speed: 4.52093
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.12113
Iter 3/10: OSS cache speed: 4.31564
Iter 3/10: ladvise speed: 4.55507
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.05075
Iter 4/10: OSS cache speed: 4.86713
Iter 4/10: ladvise speed: 4.88927
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.65583
Iter 5/10: OSS cache speed: 4.68494
Iter 5/10: ladvise speed: 4.57324
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.20455
Iter 6/10: OSS cache speed: 4.4574
Iter 6/10: ladvise speed: 4.23477
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.89041
Iter 7/10: OSS cache speed: 4.9247
Iter 7/10: ladvise speed: 4.78347
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.61506
Iter 8/10: OSS cache speed: 4.63745
Iter 8/10: ladvise speed: 4.92159
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.348
Iter 9/10: OSS cache speed: 4.75195
Iter 9/10: ladvise speed: 5.08601
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.1418
Iter 10/10: OSS cache speed: 4.80728
Iter 10/10: ladvise speed: 4.75216
Average uncached read: 4.66
Average speedup with OSS cached read:  4.56 = +-2.14%
Average speedup with ladvise willread:  4.70 = +.85%
Speedup with OSS cached read less than 20%,  got 4.56%. Skipping ladvise willread check.