== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:11:49 (1718399509)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.13507 s, 92.4 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: 2.0068
Iter 1/10: OSS cache speed: 3.28203
Iter 1/10: ladvise speed: 4.85129
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.11869
Iter 2/10: OSS cache speed: 6.5942
Iter 2/10: ladvise speed: 6.82664
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.97488
Iter 3/10: OSS cache speed: 7.06775
Iter 3/10: ladvise speed: 6.60684
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.45357
Iter 4/10: OSS cache speed: 6.48407
Iter 4/10: ladvise speed: 6.51198
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.54999
Iter 5/10: OSS cache speed: 6.47224
Iter 5/10: ladvise speed: 6.63314
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.73295
Iter 6/10: OSS cache speed: 6.53371
Iter 6/10: ladvise speed: 6.50741
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.67311
Iter 7/10: OSS cache speed: 6.52878
Iter 7/10: ladvise speed: 6.57791
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.46016
Iter 8/10: OSS cache speed: 6.40163
Iter 8/10: ladvise speed: 6.38773
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.62485
Iter 9/10: OSS cache speed: 6.44726
Iter 9/10: ladvise speed: 6.36742
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.62435
Iter 10/10: OSS cache speed: 6.38473
Iter 10/10: ladvise speed: 6.61675
Average uncached read: 5.22
Average speedup with OSS cached read:  6.21 = +18.96%
Average speedup with ladvise willread:  6.38 = +22.22%
Speedup with OSS cached read less than 20%,  got 6.21%. Skipping ladvise willread check.