== sanity test 255a: check 'lfs ladvise -a willread' ===== 03:42:17 (1722238937)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.70886 s, 148 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: 4.00943
Iter 1/10: OSS cache speed: 3.56445
Iter 1/10: ladvise speed: 4.31287
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.94274
Iter 2/10: OSS cache speed: 3.02071
Iter 2/10: ladvise speed: 3.21284
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.21541
Iter 3/10: OSS cache speed: 3.65017
Iter 3/10: ladvise speed: 3.89255
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.46942
Iter 4/10: OSS cache speed: 4.1883
Iter 4/10: ladvise speed: 4.44272
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.80445
Iter 5/10: OSS cache speed: 5.12614
Iter 5/10: ladvise speed: 6.61715
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.03585
Iter 6/10: OSS cache speed: 5.50986
Iter 6/10: ladvise speed: 6.36202
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.69648
Iter 7/10: OSS cache speed: 6.79384
Iter 7/10: ladvise speed: 6.80278
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 6.07352
Iter 8/10: OSS cache speed: 7.14716
Iter 8/10: ladvise speed: 6.53768
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.25235
Iter 9/10: OSS cache speed: 5.53649
Iter 9/10: ladvise speed: 6.97716
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.22357
Iter 10/10: OSS cache speed: 5.17517
Iter 10/10: ladvise speed: 5.32813
Average uncached read: 4.37
Average speedup with OSS cached read:  4.97 = +13.72%
Average speedup with ladvise willread:  5.44 = +24.48%
Speedup with OSS cached read less than 20%,  got 4.97%. Skipping ladvise willread check.