== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:27:36 (1736983656)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.685336 s, 153 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: 2.61478
Iter 1/10: OSS cache speed: 2.78896
Iter 1/10: ladvise speed: 2.61669
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.52264
Iter 2/10: OSS cache speed: 2.68319
Iter 2/10: ladvise speed: 3.2909
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.45752
Iter 3/10: OSS cache speed: 3.05499
Iter 3/10: ladvise speed: 3.08358
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.55116
Iter 4/10: OSS cache speed: 2.6546
Iter 4/10: ladvise speed: 2.9488
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.66196
Iter 5/10: OSS cache speed: 2.84412
Iter 5/10: ladvise speed: 3.18904
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.87718
Iter 6/10: OSS cache speed: 2.899
Iter 6/10: ladvise speed: 3.39066
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.06515
Iter 7/10: OSS cache speed: 3.19217
Iter 7/10: ladvise speed: 3.40414
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.96449
Iter 8/10: OSS cache speed: 2.00727
Iter 8/10: ladvise speed: 2.53009
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.02291
Iter 9/10: OSS cache speed: 2.71217
Iter 9/10: ladvise speed: 2.40686
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.89745
Iter 10/10: OSS cache speed: 3.35851
Iter 10/10: ladvise speed: 2.27845
Average uncached read: 2.76
Average speedup with OSS cached read:  2.81 = +1.81%
Average speedup with ladvise willread:  2.91 = +5.43%
Speedup with OSS cached read less than 20%,  got 2.81%. Skipping ladvise willread check.