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1. 发明授权

US08429282B1 System and method for avoiding system overload by maintaining an ideal request rate 有权
标题翻译：通过保持理想的请求速率避免系统过载的系统和方法
公开(公告)号：US08429282B1
公开(公告)日：2013-04-23
申请号：US13069139
申请日：2011-03-22
申请人： Sohel R. Ahuja , Jason G. McHugh
发明人： Sohel R. Ahuja , Jason G. McHugh
IPC分类号： G06F15/16
CPC分类号： G06F9/5027 , G06F2209/504 , H04L12/6418 , H04L47/19 , Y02D10/22
摘要： A computer system that provides services to clients may adaptively throttle incoming service requests in order to reach and then maintain operation at an ideal request rate. An ideal request rate may be a maximum rate at which incoming service requests can be serviced such that client-specified quality of service (QoS) expectations are met for most or all incoming service requests, or a rate within a range of rates defined by that maximum rate. Determining whether the system is operating at an ideal request rate may include determining the minimum difference between the expected and actual QoS for a group of recently serviced requests. The system may gradually modify a throttle multiplier value in order to reach or maintain an ideal request rate. Maintaining operation at an ideal request rate may allow the system to avoid entering an overloaded state, and/or oscillating between an overloaded state and a non-overloaded state.
摘要翻译：向客户端提供服务的计算机系统可以自适应地限制进入的服务请求，以便达到并且然后以理想的请求速率保持操作。理想的请求速率可以是可以服务输入服务请求的最大速率，以便对于大多数或所有传入的服务请求满足客户指定的服务质量（QoS）期望，或者由该定义的速率范围内的速率最高费率。确定系统是否以理想的请求速率运行可以包括确定一组最近服务请求的期望QoS和实际QoS之间的最小差值。系统可以逐渐修改节气门倍增器值，以达到或保持理想的请求速率。以理想请求速率维持操作可以允许系统避免进入过载状态和/或在过载状态和非过载状态之间振荡。

2. 发明授权

US08380850B1 System and method for damping overload state oscillations 有权
标题翻译：阻尼过载状态振荡的系统和方法
公开(公告)号：US08380850B1
公开(公告)日：2013-02-19
申请号：US13069118
申请日：2011-03-22
申请人： Sohel R. Ahuja , Jason G. McHugh
发明人： Sohel R. Ahuja , Jason G. McHugh
IPC分类号： G06F15/173
CPC分类号： H04L67/32 , H04L47/12
摘要： A computer system that provides services to clients may be configured to adaptively throttle incoming service requests. It may modify throttle parameters to aggressively increase throttling in response to detecting that the system is in an overloaded state. For example, a throttle multiplier value may be increased by a large amount in an attempt to quickly exit the overloaded state. The throttle multiplier value may be increased multiple times before the system exits the overloaded state. The percentage of incoming requests that are throttled and/or the particular requests that are throttled may be dependent on the throttle multiplier value and/or on a request priority rank. Some time after the system returns to a non-overloaded state, the system may gradually reduce throttling by iteratively decreasing the throttle multiplier value until it is zero. Gradually reducing throttling may allow the system to avoid oscillating between an overloaded state and a non-overloaded state.
摘要翻译：向客户端提供服务的计算机系统可以被配置为自适应地调节进入的服务请求。响应于检测到系统处于过载状态，它可以修改油门参数以大大地增加节流。例如，在尝试快速退出过载状态时，节气门倍增器值可能增加大量。在系统退出过载状态之前，节气门倍增器值可以增加多次。节流的传入请求和/或限制的特定请求的百分比可能取决于节气门倍增器值和/或请求优先级。在系统返回到非过载状态之后的一段时间内，系统可以通过迭代地减小节气门倍增器值直到它为零来逐渐减少节流。逐渐减少节流可能允许系统避免在过载状态和非过载状态之间振荡。

3. 发明授权

US09667569B1 System and method for adaptive server shielding 有权
公开(公告)号：US09667569B1
公开(公告)日：2017-05-30
申请号：US12770552
申请日：2010-04-29
申请人： Jason G. McHugh , Sohel R. Ahuja , James Christopher Sorenson, III , Allan H. Vermeulen , John David Cormie
发明人： Jason G. McHugh , Sohel R. Ahuja , James Christopher Sorenson, III , Allan H. Vermeulen , John David Cormie
IPC分类号： G06F15/16 , H04L12/931 , H04L29/08 , H04L12/801 , H04L12/803
CPC分类号： H04L49/503 , H04L47/11 , H04L47/125 , H04L67/1004 , H04L67/1008
摘要： A distributed system comprises one or more computers implementing a downstream server configured to determine whether it is overloaded and in response, to indicate to one or more upstream servers that the downstream server is in a hotspot situation. The system comprises one or more computers implementing one or more upstream servers configured to respond to receiving the indication of the hotspot situation by shielding the downstream server from subsequent requests, the shielding including serving one or more client requests without requesting service from the downstream server and reporting one or more measures of the shielded requests to the downstream server. The downstream server is further configured to determine whether the hotspot situation still exists, dependent on one or more of the reported measures.

4. 发明授权

US08392558B1 System and method for determining overload state for service requests 有权
标题翻译：用于确定服务请求的过载状态的系统和方法
公开(公告)号：US08392558B1
公开(公告)日：2013-03-05
申请号：US13069129
申请日：2011-03-22
申请人： Sohel R. Ahuja , Jason G. McHugh
发明人： Sohel R. Ahuja , Jason G. McHugh
IPC分类号： G06F15/173
CPC分类号： G06F9/505
摘要： A computer system that provides services to clients may be configured to determine whether it is operating in an overloaded state based on the percentage of client-specified quality of service (QoS) expectations that are not met. For example, if the percentage of service requests in a group of recently serviced requests for which client-specified expectations of a maximum response time were not met is greater than a pre-determined overload threshold, the system may be considered to be in an overloaded state. The overload threshold may be configurable. The overload state may be determined periodically by determining the percentage of service requests in a moving window of time for which client-specified QoS expectations were not met. In response to determining that the system is operating in an overloaded state, it may be configured to throttle at least a portion of incoming service requests in an attempt to exit the overloaded state.
摘要翻译：可以将提供服务的计算机系统配置为基于客户指定的服务质量（QoS）期望值不满足的百分比来确定其是否处于过载状态。例如，如果不满足客户指定的最大响应时间期望的最近服务请求组中的服务请求的百分比大于预定的过载阈值，则系统可能被认为处于过载状态州。过载阈值可以是可配置的。可以通过确定不满足客户端指定的QoS期望的移动时间窗口中的服务请求的百分比来周期性地确定过载状态。响应于确定系统在过载状态下操作，其可以被配置为在试图退出过载状态的情况下节流输入服务请求的至少一部分。

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