OSS数据上传下载速度比较

我用如下脚本 python sdk测oss数据上传下载的速度

#!/bin/bash
# we upload and download files from 4MB to 512MB (1GB sized-file has already been tested).
size=4
# this this where data comes from
bitbucket=dump
bucket=my_cloud_storage

while [ $size -le 2048 ]; do
    tmp_file=$size
    # block size is 1MB by default
    dd if=$bitbucket of=$tmp_file bs=1024 count=$size
    python sample_put_object.py $bucket $tmp_file $tmp_file
    rm -v $tmp_file
    python sample_get_object.py $bucket $tmp_file

    size=$((size * 2))
done其中sample_put_object.py和sample_get_object.py这么写的

#coding=utf8
from config import *
import sys
from oss_xml_handler import *
from oss_api import *


import time

HOST="storage.aliyun.com"
ACCESS_ID = YOUR_ACCESS_ID
SECRET_ACCESS_KEY = YOUR_SECRET_ACCESS_KEY
    
oss = OssAPI(HOST, ACCESS_ID, SECRET_ACCESS_KEY)
bucket = sys.argv[1]
key = sys.argv[2]
data = sys.argv[3]
#res = oss.put_object_from_string(bucket, key, data)
begin = time.time()
res = oss.put_object_from_file(bucket, key, data)
end = time.time()
if (res.status / 100) == 2:
    print res
    print "put object %s to bucket %s OK" % (key, bucket)
else:
    print "put object %s to bucket %s ERROR" % (key, bucket)
    print res.read()

print "time:", end - beginsample_get_object.py
#coding=utf8
from config import *
import sys
from oss_xml_handler import *
from oss_api import *
import time

HOST="storage.aliyun.com"
ACCESS_ID = YOUR_ACCESS_ID
SECRET_ACCESS_KEY = YOUR_SECRET_ACCESS_KEY
  
oss = OssAPI(HOST, ACCESS_ID, SECRET_ACCESS_KEY)
bucket = sys.argv[1]
key = sys.argv[2]
begin = time.time()
res = oss.get_object_to_file(bucket, key, key)
end = time.time()
if (res.status / 100) == 2:
    print "Get object %s from bucket %s OK" % (key, bucket)
    print res.getheaders()
else:
    print "Get object %s from bucket %s ERROR" % (key, bucket)
# print res.read()
print "time elapsed:", end - begin
预期的结果是读比写快 gladinet.sys-con.com/node/1584566
但是实际结果是写比读快。
不知道是什么原因，因为网络环境的问题嘛？


谢谢