may be abbreviated in different programs, but can be controlled by original intent
MCS-51 instruction English full abbreviation (1) Data transmission class instruction (7 mnemonic) mnemonic English annotation functionMOV Move transfers data from internal data register RAM and special function register SFRMOVC move Code Reader memory data table data transfer MOVX Move External RAM data transfer to external RAM XCH Exchange byte ExchangeXchd Exchange Low-order Digit low half byte switching push pu
client a fin. On the other hand, EOF sent to the server by the client is queued in the server's receive buffer, requiring the data of the receiving buffer to be completed before the EOF response can be achieved. EOF can be processed immediately only by placing the push in the TCP header control field, but at the same time it is necessary to ensure the completion of the send buffer data.
3. TCP Congestion Control
Slow start: increased by 1 index
Congestion avoidance: Linearly incre
, tail change head, and the most difficult is how to change the direction of the pointer? The method of step conversion is used here, in addition to the head pointer L, also with two cursors pointer Q and r Auxiliary movement!Code void reverselist (List l) /* Span style= "color: #008000;" > reverse operation */ {List q,p,r; P =L; Q =p->next; P ->next=null; /* */ while (Q!=null) /* cursor Q, r with L operation */ =q->next; Q ->next=L; L =Q; Q
In the Avaya switch user manual, Port monitoring is called "Port image" Port Mirror ).Run the following command to configure a port listener:{Set | clear} Port MirrorSet port listening: set port mirror
Source-port
Mirror-port
Sampling {always | disable | periodic} [max-packets-sec
]
Disable port listening: clear port mirror
In the command, mod-port-range specifies the port range; mod-port-spec specifies the specific port;
specifies the specific port; piggyback-port specifies the port of the two-way image; sampling specifies the image cycle; max-packets-sec is only used when sampling is set to periodic. It specifies the maximum number of data entries per second for the listener.
Cisco switch port monitoring configuration
Catalyst 2900XL/3500XL/2950 series switch port monitoring configuration, the following command configures port monitoring: port monitor for example, F
is established, a series of IP groupings are exchanged between the two ends of the TCP, and if the connection is only used to transfer a small amount of data, the process of establishing the connection can greatly affect the performance of HTTP. Usually, HTTP transactions do not exchange too much data, syn/syn+ack two-time handshake will produce a measurable delay, but the third handshake--tcp connection ack groupings are usually large enough, Request packets that can host the entire HTTP (the
connection is established, A series of IP groupings is exchanged between the two ends of the TCP, and if the connection is only used to transfer a small amount of data, the process of establishing a connection can greatly affect the performance of HTTP. Normally HTTP transactions do not exchange too much data, syn/syn+ An ACK of two times the handshake produces a measurable delay, but the third handshake--tcp the connection ACK packet is usually large enough to host the entire HTTP request mes
attributes in step var Stepjson = {};for (var k in Targetjson) {//Piggyback feet, remove the values from each Targetjson pxtargetjson[k] = Parsefloat (Targetjson[k]); Stepjson[k] = (Targetjson[k]-nowjson[k])/maxcount;} At this point, three very important JSON finishes. The difference is://Semaphore json:nowjson//End json:targetjson//Step json:stepjson//The three JSON all k are the same. Console.log (Semaphorejson);//Console.log (Targetjson);//Console
application relies on to manage the session. We know that in order to improve the convenience of Web applications, the information used to manage sessions, such as cookies or HTTP-based authentication (such as HTTP Basic authentication, non-form-based authentication), is stored by the browser, and automatically piggyback on this information whenever a request is sent to an application that requires authentication. That is, the browser can access sess
actually a reference to the structure field for other structures or tables.In fact, in layman's terms, Cluster table is to put a bunch of data in a sequence in a certain "field" in a "special large", in the future to follow this particular rule to read.Improve performance, save space, and piggyback to enhance security, which is what cluster table is for.One way to look up a table in the interface is to use the processing list that is used by the data
." , some of the general art of the corridor in the maze, the east of the west around the walk through about an hour later, he came to another underground palace hall outside the door.The fierce Gu ' throws the piggyback shadow to defend the submarine Step Blue Bureau plaque coal to prepare the pack vomit http://blog.51cto.com/13991827/2291507http://blog.51cto.com/13991828/2291509http://blog.51cto.com/13991830/2291511http://blog.51cto.com/13991833/229
to do, I think since the client has been the service side of the timely response, the service side data confirmation response has not needed so timely. A good optimization at this point can save the network from unnecessary waste.Typically, TCP does not send an ACK immediately when it receives data, instead it defers sending so that the ACK is sent along with the data that needs to be sent in that direction (sometimes this behavior is a piggyback ack
There are generally two types of TCP message segments, namely block data and interactive data.1. Interactive inputOn the Rlogin connection, type the data flow for an interactive command as shown in. Each interactive button produces a data packet, each time a byte key is passed from the customer to the server. The rlogin requires the remote system to echo the characters typed by the client, which results in 4 segments: (1) The interactive key from the customer (2) key confirmation from the server
Web Server responsiblity: Manager resource, handle with TCP connection, itself Administration
1. The request/response workflow:
An screenshot from firebug which measure the detail performance.
2. Proxy
Adding more than lay between client and server, it can do more things: filter, secuty, performance, cache.
Notes: trace can access this kind of proxies.
3. Cache
CDN http://en.wikipedia.org/wiki/Content_delivery_network
It need to sync, freshness check, and validation.
1, CMS is mainly used for old generation garbage collection2, this thing at the expense of the volume for the shortest garbage collection time3, some places say is four stages, some places say five stages, there are six stages, the truth is ———— I do not knowFour stages:Initial MarkConcurrent MarkRemarkConcurrent SweepFive StagesInital MarkConcurrent MarkRemarkConcurrent SweepConcurrent ResetSix stagesInital MarkConcurrent MarkConcurrent PrecleanRemarkConcurrent SweepConcurrent Reset4, the defau
part is repeated), rather than waiting for the data to be sent for a piggyback acknowledgement, or a cumulative acknowledgement if the sender receives three duplicate confirmations consecutively. It should be immediately re-transmission of the message received by the other party (there is a duplicate confirmation, indicating that the following message section is served, only the middle of the missing message segment is not delivered).The fast recover
of the time delayTypically, TCP does not send an ACK immediately when it receives data. Typically, TCP does not send an ACK immediately when it receives data, instead it defers sending so that the ACK is sent along with the data that needs to be sent in that direction (sometimes called this behavior as a data piggyback ack). Confused window syndromewhen the sending-side application produces slow data, or the receiving application processes the receiv
the packet is not received after the interval (99ms)
After the packet has been received at a certain interval (99MS)
If the player has the operation, then the confirmation information with the player's operation upstream package "piggyback" to the server; If there is no action, the confirmation information is escalated to the server at a fixed time. The client's SEQ adds 1 for each action (action), and the server SEQ adds 1 to each frame of
traffic, and the mirror port is the port that receives the traffic from the source port.● Click Apply.You can select three listening methods:1. Continuous (always): all traffic of the image.2. Period (periodic): all traffic of images within a period. Set the image cycle in sampling interval configuration.3. Disable: Disable the traffic image.
AVaya switch port image ConfigurationIn the Avaya switch user manual, port monitoring is called "port mirror ).Run the following command to configure a po
relationship for all operations in the program, called Happens-before. To ensure that the thread executing action B sees the result of operation A, the happens-before relationship must be met between A and B. If there is a lack of happens-before relationships between the two operations, the JVM can reorder them arbitrarily.16.1.4 with synchronizationBecause Happens-before is a powerful sort feature, there are times when you can "use" the visibility properties of the existing synchronization mec
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