Python django sphinx搜索始终无法从查询中获取任何内容

我使用这部分代码从sphinx获取文档，但sphinx查询始终不返回任何文档。但若我从命令行执行代码，我会得到正确的结果，有什么错

def search_query(query, offset=0):
    mode = SPH_MATCH_EXTENDED
    host = 'localhost'
    port = 9312
    index = 'rss_item'
    filtercol = 'group_id'
    filtervals = []
    sortby = '-@weights'
    groupby = 'id'
    groupsort = '@group desc'
    limit = 30

    # do query
    cl = SphinxClient()
    cl.SetServer ( host, port )
    cl.SetWeights ( [100, 1] )
    cl.SetMatchMode ( mode )

    #cl.SetSortMode(SPH_SORT_TIME_SEGMENTS)
    if limit:
        cl.SetLimits ( offset, limit, max(limit,1000) )
    res = cl.Query ( query, index )

    docs =[]
    for item in res['matches']:
        docs.append(item['id'])

    return docs

# this is django view
def search(request):
    q = request.GET.get('q', '')
    offset = int(request.GET.get('older', 0))
    docs=search_query(q, offset)

    result = Item.objects.filter(id__in=docs).all()

    objects = dict([(obj.id, obj) for obj in result])
    sorted_objects = [objects[id] for id in docs]

    result = sorted_objects

    return render_to_response('rss/_items.html',
                              {'latest_items':result, 'offset':offset+30,'q':q},
                              context_instance=RequestContext(request))

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服务器：centos6，sphinx:2.0.5，django:1.4.2，apache/wsgi

解决问题，通过关闭Selinux并重新启动服务器，我通过以下命令监听apache进程：

ps auxw | grep httpd | awk '{print"-p " $2}' | xargs strace

请参阅apache访问sphinx和memcache的权限被拒绝